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What to do with a broken monitor?
(lemmy.world)
This is a most excellent place for technology news and articles.
I'm not sure that's the solution you're looking for; but, you can set it to display only on the working side of the monitor.
So the OS would use it, as a 'smaller' screen.
How to.. on Windows [note that you also have an external softwares like CRU] (unfortunately, I can't vouch that CRU is good, I've never used it).
How to.. on Linux.
GL.