That's like the most insulting take ever. Out of perverted use cases, OCD and BPD frequents here you've frustrated my precious little animation the most.
That's not correct.
Disable taskbar animations in SystemPropertiesPerformance:
That's improbable; those icons have three layers of fallbacks. Do you experience blank icons in other parts of shell?
Modern apps which are not really launched are not displayed. But UWP is dead who cares? I'm not aware of any major scenario where app launches hidden and should be on taskbar.
Start menu will appear where main taskbar is. Move it to needed monitor.
Usually they are not so ugly.
It is intended to show only on primary tablet display. You have a tablet as a secondary monitor?
Now this is something I can try to kludge
Yes, the case where you activate native start menu on one monitor but then close via activating app on another monitor seems to be bugged. How did you enable showing start menu via Win key on non-main monitor?
This sporadic fullscreen taskbar behavior is since Windows 2000, I don't believe it's fixed in Windows 11. If you're 100% certain it doesn't happen with native taskbar, please record shortest reproduction video.
https://www.startallback.com/download.php?v=3.9.1 (previous version number)
https://startisback.com/StartAllBack_setup.exe (test version)
Beta versions are purged and not preserved.