This is particular to Apple Mac computers and, more specifically, the M1 & M2. Please take a look at the following article for more information on this topic.

You can also try the following suggestions: 

[1] In the Preferences settings > Displays. Make sure the resolution is set to 3840 x 2160.


Open the Settings panel - 

[3] Select Device Settings.

[4] Adjust the Brightness slider down a bit. 

[5] Adjust the Contrast slider down a bit.