You can hide your taskbar using Windows 11 settings, but that won't hide it completely. The only way to do that is to use a third-party application.

Make your taskbar transparent easily by toggling Transparency Effects in Settings on Windows 11. You can hide it completely by adjusting Taskbar Settings to auto-hide.

Windows 11 brings a few changes to the table and a few new ways of doing things, including how to hide the taskbar.