Thanks for the suggestion!

Can you give a concrete example how to set up and use virtual desktops, just to avoid that I am misunderstanding what you are referring to when talking about virtual desktops?

Also which OS are you referring to and do you happen to know where to find the corresponding API?

I'm running XFCE on Arch Linux, but I know virtual desktops are a thing on most linux distros, on OSX, and on windows. Maybe virtual desktops is not the most common term, some googling returned "multiple desktops" and "workspaces". Anyway, the idea is you can basically have different "sets" of windows and you can cycle through which one is the active one. Maybe you have email on one, web browser on another, text editor on another, etc. The idea is that if you switch to, say, the email virtual desktop, you could set up OBS to freeze the frame before the switch, blur the screen, display an image, etc. until switching to a different virtual desktop. Or perhaps you want to queue up different programs on different virtual desktops, and then use a different scene in OBS for some of them (perhaps with different overlays, or with overlays in different positions) and have OBS switch automatically when switching desktops.

I now added a first draft of the requested functionality with the linked PR.
So far I have only implemented the necessary functions for Linux.

You can find a test build here in a few minutes:
https://github.com/WarmUpTill/SceneSwitcher/actions/runs/843620834

Let me know if you run into any issues!
And sorry that it took so long for me to create a first somewhat working version of your request.

I merged the changes contained in the recent release to the virtual-desktop branch and started a new build:
https://github.com/WarmUpTill/SceneSwitcher/actions/runs/912233736