Hello Joseph Martin9 and welcome to the Microsoft Community!
According to your feedback, you are experiencing an issue with the taskbar not auto-hiding
We are sorry to hear that you are experiencing this issue
You can try to go to Task Manager
Then close and restart "windows explorer"
and see if that solves your problem.
Windows will be optimizing this long-standing problem.
We hope you find the above information helpful.
Kirito|Microsoft Community Support Specialist