diff --git a/src/main/ipc-handlers.ts b/src/main/ipc-handlers.ts
index bd0d401..9f3ed5f 100644
--- a/src/main/ipc-handlers.ts
+++ b/src/main/ipc-handlers.ts
@@ -24,6 +24,7 @@ import type { Result } from "@renderer/types/ipc";
 import type {
   CreateDomainParams,
   UpdateDomainParams,
+  TestDomainConnectionParams,
   GetSpacesParams,
   GetAppsParams,
   GetAppDetailParams,
@@ -206,6 +207,37 @@ function registerTestConnection(): void {
   });
 }
 
+/**
+ * Test domain connection with temporary credentials
+ */
+function registerTestDomainConnection(): void {
+  handleWithParams<TestDomainConnectionParams, boolean>(
+    "testDomainConnection",
+    async (params) => {
+      const tempDomain: DomainWithPassword = {
+        id: "temp",
+        name: "temp",
+        domain: params.domain,
+        username: params.username,
+        password: params.password || "",
+        authType: params.authType,
+        apiToken: params.apiToken,
+        createdAt: new Date().toISOString(),
+        updatedAt: new Date().toISOString(),
+      };
+
+      const client = new KintoneClient(tempDomain);
+      const result = await client.testConnection();
+
+      if (!result.success) {
+        throw new Error(result.error || "Connection failed");
+      }
+
+      return true;
+    },
+  );
+}
+
 // ==================== Browse IPC Handlers ====================
 
 /**
@@ -521,6 +553,7 @@ export function registerIpcHandlers(): void {
   registerUpdateDomain();
   registerDeleteDomain();
   registerTestConnection();
+  registerTestDomainConnection();
 
   // Browse
   registerGetSpaces();
diff --git a/src/preload/index.d.ts b/src/preload/index.d.ts
index a41aa03..d411a8e 100644
--- a/src/preload/index.d.ts
+++ b/src/preload/index.d.ts
@@ -3,6 +3,7 @@ import type {
   Result,
   CreateDomainParams,
   UpdateDomainParams,
+  TestDomainConnectionParams,
   GetSpacesParams,
   GetAppsParams,
   GetAppDetailParams,
@@ -40,6 +41,7 @@ export interface ElectronAPI {
   updateDomain: (params: UpdateDomainParams) => Promise<Result<Domain>>;
   deleteDomain: (id: string) => Promise<Result<void>>;
   testConnection: (id: string) => Promise<Result<DomainWithStatus>>;
+  testDomainConnection: (params: TestDomainConnectionParams) => Promise<Result<boolean>>;
 
   // ==================== Browse ====================
   getSpaces: (params: GetSpacesParams) => Promise<Result<KintoneSpace[]>>;
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 30396ae..23df7e0 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -13,6 +13,7 @@ const api: ElectronAPI = {
   updateDomain: (params) => ipcRenderer.invoke("updateDomain", params),
   deleteDomain: (id) => ipcRenderer.invoke("deleteDomain", id),
   testConnection: (id) => ipcRenderer.invoke("testConnection", id),
+  testDomainConnection: (params) => ipcRenderer.invoke("testDomainConnection", params),
 
   // ==================== Browse ====================
   getSpaces: (params) => ipcRenderer.invoke("getSpaces", params),
diff --git a/src/renderer/src/App.tsx b/src/renderer/src/App.tsx
index 7b5d056..43905b2 100644
--- a/src/renderer/src/App.tsx
+++ b/src/renderer/src/App.tsx
@@ -34,6 +34,10 @@ import { DeployDialog } from "@renderer/components/DeployDialog";
 const { Header, Content, Sider } = Layout;
 const { Title, Text } = Typography;
 
+// Domain section heights
+const DOMAIN_SECTION_COLLAPSED = 56; // Just show current domain
+const DOMAIN_SECTION_EXPANDED = 240; // Show full list
+
 const useStyles = createStyles(({ token, css }) => ({
   layout: css`
     min-height: 100vh;
@@ -102,13 +106,13 @@ const useStyles = createStyles(({ token, css }) => ({
     overflow: hidden;
   `,
   domainSection: css`
-    height: 200px;
     border-bottom: 1px solid ${token.colorBorderSecondary};
     overflow: hidden;
+    transition: height 0.2s ease-in-out;
   `,
   spaceSection: css`
-    height: calc(100% - 200px);
     overflow: hidden;
+    transition: height 0.2s ease-in-out;
   `,
 }));
 
@@ -120,6 +124,11 @@ const App: React.FC = () => {
 
   const { currentDomain } = useDomainStore();
   const [deployDialogOpen, setDeployDialogOpen] = React.useState(false);
+  const [domainExpanded, setDomainExpanded] = React.useState(true);
+
+  const domainSectionHeight = domainExpanded
+    ? DOMAIN_SECTION_EXPANDED
+    : DOMAIN_SECTION_COLLAPSED;
 
   return (
     <ConfigProvider locale={zhCN}>
@@ -132,10 +141,19 @@ const App: React.FC = () => {
               <span className={styles.logoText}>Kintone Manager</span>
             </div>
             <div className={styles.siderContent}>
-              <div className={styles.domainSection}>
-                <DomainManager />
+              <div
+                className={styles.domainSection}
+                style={{ height: domainSectionHeight }}
+              >
+                <DomainManager
+                  collapsed={!domainExpanded}
+                  onToggleCollapse={() => setDomainExpanded(!domainExpanded)}
+                />
               </div>
-              <div className={styles.spaceSection}>
+              <div
+                className={styles.spaceSection}
+                style={{ height: `calc(100% - ${domainSectionHeight}px)` }}
+              >
                 <SpaceTree />
               </div>
             </div>
diff --git a/src/renderer/src/components/DomainManager/DomainForm.tsx b/src/renderer/src/components/DomainManager/DomainForm.tsx
index 292696c..fe04f97 100644
--- a/src/renderer/src/components/DomainManager/DomainForm.tsx
+++ b/src/renderer/src/components/DomainManager/DomainForm.tsx
@@ -64,11 +64,23 @@ const DomainForm: React.FC<DomainFormProps> = ({ open, onClose, domainId }) => {
     try {
       const values = await form.validateFields();
 
+      // Process domain: remove protocol prefix and trailing slashes
+      let processedDomain = values.domain.trim();
+      if (processedDomain.startsWith("https://")) {
+        processedDomain = processedDomain.slice(8);
+      } else if (processedDomain.startsWith("http://")) {
+        processedDomain = processedDomain.slice(7);
+      }
+      processedDomain = processedDomain.replace(/\/+$/, "");
+
+      // Use domain as name if name is empty
+      const name = values.name?.trim() || processedDomain;
+
       if (isEdit && editingDomain) {
         const params: UpdateDomainParams = {
           id: domainId,
-          name: values.name,
-          domain: values.domain,
+          name,
+          domain: processedDomain,
           username: values.username,
           authType: values.authType,
           apiToken:
@@ -89,8 +101,8 @@ const DomainForm: React.FC<DomainFormProps> = ({ open, onClose, domainId }) => {
         }
       } else {
         const params: CreateDomainParams = {
-          name: values.name,
-          domain: values.domain,
+          name,
+          domain: processedDomain,
           username: values.username,
           password: values.password,
           authType: values.authType,
@@ -112,6 +124,48 @@ const DomainForm: React.FC<DomainFormProps> = ({ open, onClose, domainId }) => {
   };
 
   const authType = Form.useWatch("authType", form);
+  const [testing, setTesting] = React.useState(false);
+
+  // Test connection with current form values
+  const handleTestConnection = async () => {
+    try {
+      const values = await form.validateFields([
+        "domain",
+        "username",
+        "authType",
+        "password",
+        "apiToken",
+      ]);
+
+      // Process domain
+      let processedDomain = values.domain.trim();
+      if (processedDomain.startsWith("https://")) {
+        processedDomain = processedDomain.slice(8);
+      } else if (processedDomain.startsWith("http://")) {
+        processedDomain = processedDomain.slice(7);
+      }
+      processedDomain = processedDomain.replace(/\/+$/, "");
+
+      setTesting(true);
+      const result = await window.api.testDomainConnection({
+        domain: processedDomain,
+        username: values.username,
+        authType: values.authType,
+        password: values.authType === "password" ? values.password : undefined,
+        apiToken: values.authType === "api_token" ? values.apiToken : undefined,
+      });
+
+      if (result.success) {
+        message.success("连接成功");
+      } else {
+        message.error(result.error || "连接失败");
+      }
+    } catch (error) {
+      console.error("Test connection failed:", error);
+    } finally {
+      setTesting(false);
+    }
+  };
 
   return (
     <Modal
@@ -128,13 +182,8 @@ const DomainForm: React.FC<DomainFormProps> = ({ open, onClose, domainId }) => {
         className={styles.form}
         initialValues={{ authType: "password" }}
       >
-        <Form.Item
-          name="name"
-          label="名称"
-          rules={[{ required: true, message: "请输入名称" }]}
-        >
-          <Input placeholder="例如：生产环境" />
-        </Form.Item>
+        <Form.Item name="name" label="名称" style={{ marginTop: 8 }}>
+          <Input placeholder="可选，留空则使用域名" />
 
         <Form.Item
           name="domain"
@@ -142,23 +191,35 @@ const DomainForm: React.FC<DomainFormProps> = ({ open, onClose, domainId }) => {
           rules={[
             { required: true, message: "请输入域名" },
             {
-              pattern: /^[\w.-]+$/,
-              message: "请输入有效的域名，例如：company.kintone.com",
+              validator: (_, value) => {
+                if (!value) return Promise.resolve();
+                // Allow https:// or http:// prefix
+                let domain = value.trim();
+                if (domain.startsWith("https://")) {
+                  domain = domain.slice(8);
+                } else if (domain.startsWith("http://")) {
+                  domain = domain.slice(7);
+                }
+                // Remove trailing slashes
+                domain = domain.replace(/\/+$/, "");
+                // Validate domain format
+                if (/^[\w.-]+$/.test(domain)) {
+                  return Promise.resolve();
+                }
+                return Promise.reject(new Error("请输入有效的域名"));
+              },
             },
           ]}
         >
-          <Input placeholder="例如：company.kintone.com" />
+          <Input placeholder="https://company.kintone.com" />
         </Form.Item>
 
         <Form.Item
           name="username"
           label="用户名"
-          rules={[
-            { required: true, message: "请输入用户名" },
-            { type: "email", message: "请输入有效的邮箱地址" },
-          ]}
+          rules={[{ required: true, message: "请输入用户名" }]}
         >
-          <Input placeholder="登录 Kintone 的邮箱地址" />
+          <Input placeholder="登录 Kintone 的用户名" />
         </Form.Item>
 
         <Form.Item
@@ -197,6 +258,9 @@ const DomainForm: React.FC<DomainFormProps> = ({ open, onClose, domainId }) => {
         <Form.Item style={{ marginTop: 24, marginBottom: 0 }}>
           <Space style={{ width: "100%", justifyContent: "flex-end" }}>
             <Button onClick={onClose}>取消</Button>
+            <Button onClick={handleTestConnection} loading={testing}>
+              测试连接
+            </Button>
             <Button type="primary" onClick={handleSubmit} loading={loading}>
               {isEdit ? "更新" : "创建"}
             </Button>
diff --git a/src/renderer/src/components/DomainManager/DomainManager.tsx b/src/renderer/src/components/DomainManager/DomainManager.tsx
index 259704b..01b5727 100644
--- a/src/renderer/src/components/DomainManager/DomainManager.tsx
+++ b/src/renderer/src/components/DomainManager/DomainManager.tsx
@@ -1,11 +1,18 @@
 /**
  * DomainManager Component
  * Main container for domain management
+ * Supports collapsed/expanded view
  */
 
 import React from "react";
-import { Button, Empty, Spin } from "antd";
-import { PlusOutlined, ReloadOutlined } from "@ant-design/icons";
+import { Button, Empty, Spin, Tooltip, Avatar, Space } from "antd";
+import {
+  PlusOutlined,
+  ReloadOutlined,
+  CloudServerOutlined,
+  UpOutlined,
+  DownOutlined,
+} from "@ant-design/icons";
 import { createStyles } from "antd-style";
 import { useDomainStore } from "@renderer/stores";
 import DomainList from "./DomainList";
@@ -19,6 +26,12 @@ const useStyles = createStyles(({ token, css }) => ({
     padding: ${token.paddingLG}px;
     background: ${token.colorBgContainer};
   `,
+  collapsedContainer: css`
+    height: 100%;
+    display: flex;
+    flex-direction: column;
+    background: ${token.colorBgContainer};
+  `,
   header: css`
     display: flex;
     justify-content: space-between;
@@ -47,11 +60,61 @@ const useStyles = createStyles(({ token, css }) => ({
     align-items: center;
     height: 200px;
   `,
+  collapsedHeader: css`
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: ${token.paddingSM}px ${token.paddingMD}px;
+    cursor: pointer;
+    transition: background 0.2s;
+
+    &:hover {
+      background: ${token.colorBgTextHover};
+    }
+  `,
+  collapsedInfo: css`
+    display: flex;
+    align-items: center;
+    gap: ${token.paddingSM}px;
+    flex: 1;
+    min-width: 0;
+  `,
+  collapsedName: css`
+    font-weight: ${token.fontWeightStrong};
+    font-size: ${token.fontSize}px;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  `,
+  collapsedUrl: css`
+    color: ${token.colorTextSecondary};
+    font-size: ${token.fontSizeSM}px;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  `,
+  collapsedActions: css`
+    display: flex;
+    gap: ${token.paddingXS}px;
+  `,
+  noDomainText: css`
+    color: ${token.colorTextSecondary};
+    font-size: ${token.fontSizeSM}px;
+    padding: ${token.paddingSM}px ${token.paddingMD}px;
+  `,
 }));
 
-const DomainManager: React.FC = () => {
+interface DomainManagerProps {
+  collapsed?: boolean;
+  onToggleCollapse?: () => void;
+}
+
+const DomainManager: React.FC<DomainManagerProps> = ({
+  collapsed = false,
+  onToggleCollapse,
+}) => {
   const { styles } = useStyles();
-  const { domains, loading, loadDomains } = useDomainStore();
+  const { domains, loading, loadDomains, currentDomain } = useDomainStore();
   const [formOpen, setFormOpen] = React.useState(false);
   const [editingDomain, setEditingDomain] = React.useState<string | null>(null);
 
@@ -78,20 +141,83 @@ const DomainManager: React.FC = () => {
     loadDomains();
   };
 
+  // Collapsed view - show current domain only
+  if (collapsed) {
+    return (
+      <div className={styles.collapsedContainer}>
+        <div className={styles.collapsedHeader} onClick={onToggleCollapse}>
+          <div className={styles.collapsedInfo}>
+            <Avatar
+              icon={<CloudServerOutlined />}
+              size="small"
+              style={{
+                backgroundColor: currentDomain ? "#1890ff" : "#d9d9d9",
+              }}
+            />
+            <div style={{ flex: 1, minWidth: 0 }}>
+              {currentDomain ? (
+                <>
+                  <div className={styles.collapsedName}>
+                    {currentDomain.name}
+                  </div>
+                  <div className={styles.collapsedUrl}>
+                    {currentDomain.domain}
+                  </div>
+                </>
+              ) : (
+                <div className={styles.collapsedName}>未选择 Domain</div>
+              )}
+            </div>
+          </div>
+          <Space>
+            <Tooltip title="添加 Domain">
+              <Button
+                type="text"
+                size="small"
+                icon={<PlusOutlined />}
+                onClick={(e) => {
+                  e.stopPropagation();
+                  handleAdd();
+                }}
+              />
+            </Tooltip>
+            <Tooltip title="展开">
+              <Button
+                type="text"
+                size="small"
+                icon={<DownOutlined />}
+              />
+            </Tooltip>
+          </Space>
+        </div>
+
+        <DomainForm
+          open={formOpen}
+          onClose={handleCloseForm}
+          domainId={editingDomain}
+        />
+      </div>
+    );
+  }
+
+  // Expanded view - full list
   return (
     <div className={styles.container}>
       <div className={styles.header}>
         <h2 className={styles.title}>Domain 管理</h2>
         <div className={styles.actions}>
-          <Button
-            icon={<ReloadOutlined />}
-            onClick={handleRefresh}
-            loading={loading}
-          >
-            刷新
-          </Button>
+          <Tooltip title="收起">
+            <Button icon={<UpOutlined />} onClick={onToggleCollapse} />
+          </Tooltip>
+          <Tooltip title="刷新">
+            <Button
+              icon={<ReloadOutlined />}
+              onClick={handleRefresh}
+              loading={loading}
+            />
+          </Tooltip>
           <Button type="primary" icon={<PlusOutlined />} onClick={handleAdd}>
-            添加 Domain
+            添加
           </Button>
         </div>
       </div>
diff --git a/src/renderer/src/types/ipc.ts b/src/renderer/src/types/ipc.ts
index fd4c6ef..1c0e910 100644
--- a/src/renderer/src/types/ipc.ts
+++ b/src/renderer/src/types/ipc.ts
@@ -38,6 +38,14 @@ export interface UpdateDomainParams {
   apiToken?: string;
 }
 
+export interface TestDomainConnectionParams {
+  domain: string;
+  username: string;
+  authType: "password" | "api_token";
+  password?: string;
+  apiToken?: string;
+}
+
 // ==================== Browse IPC Types ====================
 
 export interface GetSpacesParams {
@@ -126,6 +134,7 @@ export interface ElectronAPI {
   updateDomain: (params: UpdateDomainParams) => Promise<Result<Domain>>;
   deleteDomain: (id: string) => Promise<Result<void>>;
   testConnection: (id: string) => Promise<Result<DomainWithStatus>>;
+  testDomainConnection: (params: TestDomainConnectionParams) => Promise<Result<boolean>>;
 
   // Browse
   getSpaces: (params: GetSpacesParams) => Promise<Result<KintoneSpace[]>>;