diff --git a/app_window_fix.go b/app_window_fix.go
new file mode 100644
index 0000000..56cfa92
--- /dev/null
+++ b/app_window_fix.go
@@ -0,0 +1,133 @@
+//go:build windows
+
+package main
+
+import (
+	"strings"
+	"sync/atomic"
+	"syscall"
+	"time"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+// Chrome_WidgetWin 系列类名是 WebView2 的宿主窗口层级
+const webviewHostClassFragment = "Chrome_WidgetWin"
+
+// wmSize Win32 窗口尺寸变化消息
+const wmSizeMsg uint32 = 0x0005
+
+var (
+	// user32 对这三个 API 只导出无后缀名（无 A/W 变体，带 W 后缀找不到 proc 会 panic）
+	procGetClientRectFix = windows.NewLazySystemDLL("user32.dll").NewProc("GetClientRect")
+	procSetWindowPosFix  = windows.NewLazySystemDLL("user32.dll").NewProc("SetWindowPos")
+	procGetAncestorFix   = windows.NewLazySystemDLL("user32.dll").NewProc("GetAncestor")
+)
+
+// 修复去重：同一时刻只允许一个校验在跑（回调写共享切片要求互斥）
+var webviewFixRunning atomic.Bool
+
+// 当前校验的目标主窗口（枚举回调过滤直属子窗口用）
+var webviewTargetHwnd uintptr
+
+// webviewHosts 收集结果容器；enumChildWebviewHosts 回调写入
+var webviewHosts []windows.HWND
+
+// 包级变量：syscall.NewCallback 指向的 Go 闭包必须存活于整个进程生命周期
+var enumChildWebviewHosts = syscall.NewCallback(func(h uintptr, _ uintptr) uintptr {
+	// GA_PARENT(1)：只收直属子窗口，避免动到更深层的 WebView2 内部窗口
+	parent, _, _ := procGetAncestorFix.Call(h, 1)
+	if parent != webviewTargetHwnd {
+		return 1
+	}
+	var buf [256]uint16
+	if _, err := windows.GetClassName(windows.HWND(h), &buf[0], int32(len(buf))); err != nil {
+		return 1
+	}
+	if strings.Contains(syscall.UTF16ToString(buf[:]), webviewHostClassFragment) {
+		webviewHosts = append(webviewHosts, windows.HWND(h))
+	}
+	return 1
+})
+
+// checkAndFixFill 校验 WebView2 宿主是否铺满窗口客户区，未铺满则强制铺满。
+// wails alpha 的 WM_SIZE 处理存在竞态：主线程忙时消息被 resizePending 标志丢弃，
+// 迟到执行的重铺又使用闭包捕获的过期 bounds，webview 会停在中间尺寸且不再有
+// 新消息来纠正，表现为整个应用内容收窄、四周露出窗口底色。
+func checkAndFixFill(hwnd uintptr) {
+	if hwnd == 0 {
+		return
+	}
+	var rc struct{ Left, Top, Right, Bottom int32 }
+	if r, _, _ := procGetClientRectFix.Call(hwnd, uintptr(unsafe.Pointer(&rc))); r == 0 {
+		return
+	}
+	cw, ch := int(rc.Right-rc.Left), int(rc.Bottom-rc.Top)
+	if cw <= 0 || ch <= 0 {
+		return
+	}
+
+	webviewTargetHwnd = hwnd
+	webviewHosts = webviewHosts[:0]
+	windows.EnumChildWindows(windows.HWND(hwnd), enumChildWebviewHosts, nil)
+	for _, h := range webviewHosts {
+		// SWP_NOZORDER(0x0004)：只改尺寸位置，不干预 wails 管理的层级
+		procSetWindowPosFix.Call(uintptr(h), 0, 0, 0, uintptr(cw), uintptr(ch), 0x0004)
+	}
+}
+
+// runGuarded 统一 panic 兜底：windowsgui 下 goroutine panic 会静默杀进程
+func runGuarded(fn func()) {
+	defer func() { recover() }()
+	fn()
+}
+
+// fixWebviewFill WM_SIZE 路径：等 resize 序列结束、wails 内部去抖落定后校验一次
+func fixWebviewFill(hwnd uintptr) {
+	if !webviewFixRunning.CompareAndSwap(false, true) {
+		return
+	}
+	go func() {
+		defer webviewFixRunning.Store(false)
+		runGuarded(func() {
+			time.Sleep(150 * time.Millisecond)
+			checkAndFixFill(hwnd)
+		})
+	}()
+}
+
+// StartWebviewFillWatch 周期兜底：覆盖"无新 WM_SIZE 的迟到重放"场景
+// （主线程忙时排队的过期重绘在窗口静止时才执行，此时不会产生任何 WM_SIZE）
+func StartWebviewFillWatch() {
+	go runGuarded(func() {
+		for {
+			time.Sleep(3 * time.Second)
+			if webviewFixRunning.CompareAndSwap(false, true) {
+				runGuarded(func() {
+					checkAndFixFill(findMainWindowHwnd())
+				})
+				webviewFixRunning.Store(false)
+			}
+		}
+	})
+}
+
+// findMainWindowHwnd 找本进程的可见主窗口
+func findMainWindowHwnd() uintptr {
+	var found uintptr
+	pid := windows.GetCurrentProcessId()
+	cb := syscall.NewCallback(func(h uintptr, _ uintptr) uintptr {
+		var winPid uint32
+		windows.GetWindowThreadProcessId(windows.HWND(h), &winPid)
+		if winPid == pid && windows.IsWindowVisible(windows.HWND(h)) {
+			found = h
+			return 0
+		}
+		return 1
+	})
+	runGuarded(func() {
+		windows.EnumWindows(cb, nil)
+	})
+	return found
+}
diff --git a/frontend/src/components/FileSystem/index.vue b/frontend/src/components/FileSystem/index.vue
index 2bb9c59..b8fe180 100644
--- a/frontend/src/components/FileSystem/index.vue
+++ b/frontend/src/components/FileSystem/index.vue
@@ -513,8 +513,11 @@ const fileEditorPanelConfig = computed(() => {
     currentFileExtension,
     isBinaryFile: isBinaryFileRef.value,
     fileMtime: selectedFileItem.value?.modified_time || '',
-    // 多 tab
-    previewTabs: multiPreview.tabs.value,
+    // 多 tab（按当前服务器过滤，跨服务器的标签不显示在浮动标签栏）
+    previewTabs: (() => {
+      const pid = connectionManager.activeProfile?.id
+      return multiPreview.tabs.value.filter(t => (t.profileId ?? 'local-default') === pid)
+    })(),
     activeTabId: multiPreview.activeTabId.value,
     // 预览插件(优先于内置 v-if 链;.drawio/.dio 命中,其余为 null)
     activePlugin: currentFileName ? resolvePreviewHandler(currentFileName) : null,
@@ -569,6 +572,7 @@ const handleFileChanged = async (event: any) => {
 // 同路径也强制重载：navigate 同路径早退时列表会永远不加载
 const switchConnection = async (profileId: string) => {
   await connectionManager.connect(profileId)
+  await syncPreviewToActiveProfile()
   await loadCommonPaths()
   const targetPath = connectionManager.isRemote() ? '/' : 'C:/'
   if (filePath.value === targetPath) {
@@ -596,6 +600,7 @@ const handleGoToPath = async (path: string) => {
   const targetProfileId = getProfileIdForPath(path)
   if (targetProfileId && targetProfileId !== connectionManager.activeProfile?.id) {
     await connectionManager.connect(targetProfileId)
+    await syncPreviewToActiveProfile()
   }
   await navigate(path)
 }
@@ -1459,6 +1464,26 @@ const doCloseTab = (tabId: string) => {
   }
 }
 
+/** 切换服务器后预览区联动：只显示当前服务器的标签与内容，避免旧服务器文档残留卡住 */
+const syncPreviewToActiveProfile = async () => {
+  const currentProfileId = connectionManager.activeProfile?.id
+  const isMine = (t: PreviewTab) => (t.profileId ?? 'local-default') === currentProfileId
+
+  const active = multiPreview.activeTab.value
+  if (active && isMine(active)) return
+
+  // 面板上残留的是旧服务器内容，先缓存回它自己的 tab（loaded 标记让切回时秒恢复）
+  cacheCurrentTabState()
+  const mine = multiPreview.tabs.value.find(isMine)
+  if (mine) {
+    await activateTab(mine)
+  } else {
+    // 当前服务器没有已打开的预览：回到空白预览态
+    selectedFileItem.value = null
+    clearContent()
+  }
+}
+
 /** 缓存当前 tab 的编辑状态 */
 const cacheCurrentTabState = () => {
   multiPreview.cacheCurrentTab({
diff --git a/main.go b/main.go
index 9a2b3f5..472e8aa 100644
--- a/main.go
+++ b/main.go
@@ -64,6 +64,9 @@ func main() {
 						app.HandleHotkey()
 						return 0, true
 					}
+				case wmSizeMsg:
+					// webview 尺寸失同步兜底（app_window_fix.go）
+					go fixWebviewFill(hwnd)
 				}
 				return 0, false
 			},
@@ -105,6 +108,9 @@ func main() {
 
 	app.SetMainWindow(window)
 
+	// webview 与窗口尺寸失同步的周期兜底（app_window_fix.go）
+	StartWebviewFillWatch()
+
 	// 外部文件拖入窗口（OS 资源管理器拖放）：把本地路径转发给前端处理
 	// （本机面板=复制进当前目录，SFTP 面板=上传）
 	window.OnWindowEvent(events.Common.WindowFilesDropped, func(event *application.WindowEvent) {