This KWin script provides user definable shortcuts that let you move all your windows to a specific screen. If you want to quickly move all windows from one screen to another this is for you.
Updated by Al Williams for KDE6
I like to work with two screens, the laptop screen and my external monitor(s). When I disconnect my monitor all windows are automatically moved to the laptop screen which is nice, but when I reconnect the monitor all windows remain on the laptop screen. This is inconvenient as I mostly want my windows on the external screen when I have it connected. This KWin script solves that issue by providing shortcuts for moving all windows to a specific screen.
First clone this repo and run the following command in the root directory of the repo (note that KWin has two capital letters and, yes, it matters).
kpackagetool6 --type KWin/Script -i .
After that open KWin Scripts (System Settings -> Window Management -> KWin Scripts) and enable "Move All Windows to Screen". This won't yet enable any shortcuts, you can define your own key bindings. See Setup for details.
If you need to update the script to a new version pull the repo again and run:
kpackagetool6 --type KWin/Script -r moveallwindowstoscreen
kpackagetool6 --type KWin/Script -i .
Open System Settings and go to Shortcuts -> Global Shortcuts -> Kwin. You should see new shortcuts available there (for moving windows to screen 0, 1, 2 and 3). Just add shortcuts for the ones you need and that's it.