Auto-hiding the Windows Taskbar is a useful way to eek out a little extra screen real estate.  But, what do you do if it’s not working? Granted, most of the time it works without issue, but there’s always the outlier, the instance when Taskbar just won’t auto-hide, no matter how many times you restart your computer.

We’re going to break this up into four parts. We’ll start with the most likely cause, and continue troubleshooting from there. If auto-hide begins to work, you can stop at any time, as the extra steps are unnecessary.
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https://www.laptopmag.com/articles/windows-taskbar-wont-auto-hide