I am using Manjaro KDE Plasma
I want to assign different workspaces to different monitors but I am not able to go to settings
Worskpaces can’t be assigned per separate monitors, unless you go Multihead - ArchWiki hence each Monitor is on separate Screen, but then is not possible to move windows between Screens, apart from a few special programs like GIMP…
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I’ve marked this answer as the solution to your question as it is by far the best answer you’ll get.
However, if you disagree with my choice, please feel free to take any other answer as the solution to your question or even remove the solution altogether: You are in control! (If you disagree with my choice, just send me a personal message and explain why I shouldn’t have done this or 
or 
if you agree)
P.S. In the future, please don’t forget to come back and click the 3 dots below the answer to mark a solution like this below the answer that helped you most:
so that the next person that has the exact same problem you just had will benefit from your post as well as your question will now be in the “solved” status.