I use Okular for PDFs and others on Linux. The default settings need changed.
Also I find Mate Desktop (with adjusted settings) better than Cinnamon. Zero effects except for a faint shadow around windows and no animation.
My LG screen has brightness at 11 and contrast at 36. A 4K 23″ HDR 'paper like quality' display with zero flicker. 2x HDMI and one DisplayPort inputs.
No glare/reflections. The Apple own brand stuff is terribly shiny. I visited their big showroom here.
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