It’s been happening since the ver 3 - if using Dorico window over multiple monitors (typically with large scores), any color change would compress the window down to on single monitor. Very frustrating when many items need to be adjusted… any suggestion except for not working on multiple monitors:-)?
Is this Windows or Mac?
There have been reports of a few weird glitches with multiple monitors. Most of it lies at the feet of the Qt framework that the team uses to provide the cross-platform interface.
If you can provide a video, and/or reproducible steps, and details of your hardware setup, that would be useful in helping the team track it down. A Diagnostic Report probably wouldn’t hurt, either.
This is MAC Studio 2023, M2 MAX, 64 GB with four monitors connected. Attached video with reproducable process and diagnostis, thanks for looking into it… m
Dorico Diagnostics.zip (1.8 MB)
OT: okay, let me just say “wow!” Have you programmed keyboard commands for turning your head to the correct one? 
happy to teach you:))
First I’d have to buy three more monitors! And with my aging and transition-lens glasses-dependent eyes, I consider myself fortunate when I manage to focus on one. 
Maybe one of these days a second…. I’m keeping an eye on this interesting thread in that event.