This behavior is default but it can be changed such that a user can switch active windows just by hovering the mouse cursor over the window. This behavior was not present in Windows Vista, Windows XP or earlier Operating Systems but Windows 7, Windows 8.1 and Windows 10 include this feature by default. You just have to enable it to activate the functionality. Let’s go through the process step by step: This should activate the mouse hovering feature for you. Now if there are many windows open on your Desktop, just hovering over the mouse on any window will bring it to front making it the active window.