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I would like to be able to assign a workspace to an external monitor.
For example, I could set up an overhead projector as workspace4, and the laptop monitor would be able to see all workspace.

The advantage would be to be able to read something that is not on the projector, and to easily move windows from or to the "overhead projector workspace" (4 in the example)...

It would be much more confortable than extending the desktop...

Looks like feature request https://bugs.kde.org/show_bug.cgi?id=107302