diff --git a/src/main/index.ts b/src/main/index.ts
index d67a8f0189..e53fbb4b42 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -6,7 +6,7 @@ import { app } from 'electron'
 import installExtension, { REACT_DEVELOPER_TOOLS, REDUX_DEVTOOLS } from 'electron-devtools-installer'
 import Logger from 'electron-log'
 
-import { isDev } from './constant'
+import { isDev, isWin } from './constant'
 import { registerIpc } from './ipc'
 import { configManager } from './services/ConfigManager'
 import mcpService from './services/MCPService'
@@ -24,6 +24,16 @@ import { setUserDataDir } from './utils/file'
 
 Logger.initialize()
 
+/**
+ * Disable chromium's window animations
+ * main purpose for this is to avoid the transparent window flashing when it is shown
+ * (especially on Windows for SelectionAssistant Toolbar)
+ * Know Issue: https://github.com/electron/electron/issues/12130#issuecomment-627198990
+ */
+if (isWin) {
+  app.commandLine.appendSwitch('wm-window-animations-disabled')
+}
+
 // in production mode, handle uncaught exception and unhandled rejection globally
 if (!isDev) {
   // handle uncaught exception