diff --git a/Source/Modules/WindowControllers/CtlAboutWindow.swift b/Source/Modules/WindowControllers/CtlAboutWindow.swift
index d1ee69a9..7502b039 100644
--- a/Source/Modules/WindowControllers/CtlAboutWindow.swift
+++ b/Source/Modules/WindowControllers/CtlAboutWindow.swift
@@ -17,11 +17,12 @@ class CtlAboutWindow: NSWindowController {
 
   static func show() {
     if shared == nil { shared = CtlAboutWindow(windowNibName: "frmAboutWindow") }
-    guard let sharedWindow = shared?.window else { return }
+    guard let shared = shared, let sharedWindow = shared.window else { return }
     sharedWindow.setPosition(vertical: .top, horizontal: .left, padding: 20)
     sharedWindow.orderFrontRegardless()  // 逼著視窗往最前方顯示
     sharedWindow.level = .statusBar
     sharedWindow.titlebarAppearsTransparent = true
+    shared.showWindow(shared)
     NSApp.activate(ignoringOtherApps: true)
   }
 
diff --git a/Source/Modules/WindowControllers/CtlClientListMgr.swift b/Source/Modules/WindowControllers/CtlClientListMgr.swift
index 3c3be865..3680c286 100644
--- a/Source/Modules/WindowControllers/CtlClientListMgr.swift
+++ b/Source/Modules/WindowControllers/CtlClientListMgr.swift
@@ -18,11 +18,12 @@ class CtlClientListMgr: NSWindowController, NSTableViewDelegate, NSTableViewData
 
   static func show() {
     if shared == nil { shared = CtlClientListMgr(windowNibName: "frmClientListMgr") }
-    guard let sharedWindow = shared?.window else { return }
+    guard let shared = shared, let sharedWindow = shared.window else { return }
     sharedWindow.setPosition(vertical: .center, horizontal: .right, padding: 20)
     sharedWindow.orderFrontRegardless()  // 逼著視窗往最前方顯示
     sharedWindow.level = .statusBar
     sharedWindow.titlebarAppearsTransparent = true
+    shared.showWindow(shared)
     NSApp.activate(ignoringOtherApps: true)
   }
 
diff --git a/Source/Modules/WindowControllers/CtlPrefWindow.swift b/Source/Modules/WindowControllers/CtlPrefWindow.swift
index 0e3a511b..180de72e 100644
--- a/Source/Modules/WindowControllers/CtlPrefWindow.swift
+++ b/Source/Modules/WindowControllers/CtlPrefWindow.swift
@@ -66,13 +66,14 @@ class CtlPrefWindow: NSWindowController, NSWindowDelegate {
   public static var shared: CtlPrefWindow?
 
   static func show() {
-    shared = CtlPrefWindow(windowNibName: "frmPrefWindow")
-    guard let sharedWindow = shared?.window else { return }
+    if shared == nil { shared = CtlPrefWindow(windowNibName: "frmPrefWindow") }
+    guard let shared = shared, let sharedWindow = shared.window else { return }
     sharedWindow.delegate = shared
     sharedWindow.setPosition(vertical: .top, horizontal: .right, padding: 20)
     sharedWindow.orderFrontRegardless()  // 逼著視窗往最前方顯示
     sharedWindow.level = .statusBar
     sharedWindow.titlebarAppearsTransparent = true
+    shared.showWindow(shared)
     NSApp.activate(ignoringOtherApps: true)
   }