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That may be a Mac problem I do recall have a problem like that with my old thinkpad when using an external display. However, I keep mostly Photoshop Palettes on the externals display and mostly edited images one the thinkpad display for image looked better on it because of it 133dpi resolution and its ips color was good in my eyes. All Desktop displays are externals and I have two or three displays on my PCs and have never seen a problem like that using Windows Photoshop. The display I edit image on mostlt us a Dell 24" 4k Display.
Thanks for the reply JJMack. (Sorry for the incomplete question. my session was expired, re-login caused missed content.).
When I apply brush, it would be normal.
I mainly bought 4K Monitor for Photoshop, and I see many issues using with Photoshop.
1. cursor lag - Issue solved with Photoshop Preferences -> GPU settings to Basic
2. Fonts are too small and brush outer line is too thin, almost not visible. - Issue solved with Scaling to 1080p. (seems, No use of 4K now )
3. Colored horizontal lines in Macbook.
4. Now this Zoom In - zoom out.
If my MBP is not compatible, better return this Monitor and buy iMAC.
Thank you ... Very useful info.
As per the link,
"Graphical glitches can occur, and you may encounter random issues and display problems that make the monitor appear as two separate displays instead of one. I’ve had mixed results when using MST, but now that Single-Stream Transport displays are available ..... "
Unfortunately my model 2013 Macbook Pro doesn't support SST. The model listed there is 2013 Mac Pro.