I’m not sure how to ask this but I remember a while back you could set each desktop with its own screen image. Does that make sense? Is it possible with Plasma?
I’m not sure where to start looking for this one nor how to formulate it.
Unless you are using activities for something else already, you can use activities in place of virtual desktops. They have all the same features as virtual desktops and more features on top of those.
Once you set it up, you won’t even know the difference.
In system settings->workspace behavior->virtual desktops delete them all except for 1
In system settings->workspace behavior->activities create the number of them you want
Edit the panel and replace the “pager” with the “activity pager”
That should be all there is to it. If you use specific hotkeys to switch desktops you either need to learn the new ones or move the ones you already use from desktops to activities.