Taskbar and multiple monitors

I have three monitors with the central as the main screen. I also like to hide the taskbar as it distracts me during normal work, however sometimes I want to unhide it, which I can do from the main screen but is not possible from either of the other screens. Also when I unhide it from the central screen it doesn't always appear on-top of the fullscreen applications displayed on the other screens e.g. Outlook, Edge, etc.

I am using Win 11 21H2 version 22000.348 with all patches and updates applied.

Any ideas or suggestions on how to resolve either of these issues?

I don't have a second monitor but try this. On your main display, try right clicking on taskbar-taskbar settings-taskbar behaviors-make sure both "automatically hide the taskbar" and "show my taskbar on all displays' is checked. Under "when using multiple displays, show my taskbar apps on" toggle the arrow to be "all taskbars"

There's also a third party app called TaskBarX that controls most every aspect of the taskbar itself as well as options for multiple displays. I have personally never used it but others on these forums have suggested it. It is installable, but there is also a portable version of it you can try before you install it. It came out for Windows 10 but there is also a Win11 version now. There's a small fee if you get it from the windows store but it's free if you download it.

I too, had the issue of my taskbar not appearing on top of full screen apps, but I could get it to show by clicking the restore/maximize button. I noticed it was mainly for programs I had installed rather than Windows apps. I believe this is by design. I have always been notorious for setting all the programs I use regularly to open maximized so what I did was change their properties back to run as normal window, then dragging the window edges to be a hair shy of full screen. When the app is closed, windows remembers its size and opens that way the next time it is used and my taskbar appears on top of it. Hope it works for you.