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I installed the DDPM app, but don't really use it.
Actually, it won't even run on my "Main OS" (2018 Mini using Mojave).
When I use it on my "experimental copy" of Sequoia, its functions seem limited.

I found that "BetterDisplay" is much better, so I use that instead.
Even the free (unregistered) version is better.
What resolution do you run with this monitor ?
 
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