Right-click the taskbar
Select Taskbar settings
Turn on Automatically hide the taskbar
On Windows 11, open Settings
Go to Personalization
Select Taskbar
Open Taskbar behaviors
Check Automatically hide the taskbar
On Windows 10, open Settings
Go to Personalization
Select Taskbar
Turn on Automatically hide the taskbar in desktop mode
Turn on Automatically hide the taskbar in tablet mode
Press F11 in a browser or app for full screen
Restart Windows Explorer if the taskbar does not hide
Check for apps or notifications keeping the taskbar visible