If you need to hide the taskbar to increase the screen area, please see the article on how to hide and show the Taskbar on Windows 10 below.
Position the Taskbar at the bottom of the Desktop screen, it shows the applications you are using and the installed applications are displayed by default on the Taskbar:
In Windows 10, it allows you to hide the taskbar when you move away from the position of the bar and display the taskbar when you move into the position of the bar. To do so, follow these steps:
Step 1: Right-click the Taskbar -> Taskbar Settings:
Step 2: The Settings dialog box appears under Automatically hide the taskbar in desktop mode, turn the switch to ON to turn on the auto-hide of the Taskbar:
So after turning on the auto-hide of the Taskbar, it automatically collapses to the bottom:
Only when you move into the taskbar position will it slowly show up:
If you do not want to hide the Taskbar, you want to fix it on the Desktop -> turn Off mode in Automatically hide the taskbar in desktop mode
Above is a detailed guide How to hide, show the Taskbar on Windows 10. Wish you success!