Q&A for How to Hide the Windows Taskbar

If there is a blank white or colored space after your taskbar tucks itself away, it is likely a glitch, so you should restart your device.

Right click the taskbar and choose "Properties". In the menu that opens, click the option that says "Auto-hide the taskbar". This will cause the taskbar to disappear until you mouse over where it is on the screen.

If there is some sort of "urgent" pop-up, like another application, open and re-minimize your current tasks. If this does not work, look toward the left side of the task bar. There should be a little arrow to expand. Click it, and check if there is anything there. It most likely will be that Java needs to be updated.

Right click on the task bar and select "Properties." The first thing you should see is "Lock the taskbar" with a checkmark, simply click on the checkmark to hide it.

Maybe it's because of notifications that are on the system tray or on the task bar, you could remove or disable the notifications temporarily if you want to.