What you want to ask is what can you do by double-clicking the application control menu icon with the left mouse button in windows? Close the application.

In Windows, double-click the application control menu icon (usually a box with an X) with the left mouse button to close the application. This icon is located on the taskbar, or when the application window cannot be found on the taskbar, it can be found in the Task Manager. Double-click this icon to open the close program window, and then confirm to close the application.