1) Open the Start menu and type regedit in the search bar

2) Proceed to the following directory: HKEY_Current_USER\Control Panel\Mouse

3) Right click the MouseHoverTime key and choose Modify

4) Change it to a value between 0 and 4000. The number you input will be the millisecond delay before thumbnail previews activate when you hover your mouse over an application.I don’t recommend selecting a value of 0 for this option.

Changes don’t take place until you restart your computer.