SUMMARY
Windows always appear in all activities, regardless of what activity I open them in. The context menu (Alt+F3) doesn't give the option to select activities, but the right clicking the icon in the taskbar does. However, regardless of what activity I set the window to when I right click on the icon in the taskbar it usually says "All Activities". Rarely, it actually does remember what activity I set an application to, but even then the application appears on all activities (the icon disappears from the taskbar while I'm in an activity the application isn't supposed to be in though).


SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.1
Kernel Version: 5.8.11-xanmod1-1
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-4460S CPU @ 2.90GHz
Memory: 7.2 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4600

ADDITIONAL INFORMATION
I did try upgrading to 5.19.90 but that didn't change the behavior at all so I downgraded back to 5.19.5 due to other ui issues.