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:
 In the Preferences settings > Displays. Make sure the resolution is set to 3840 x 2160.
Open the Settings panel -
 Select Device Settings.
 Adjust the Brightness slider down a bit.
 Adjust the Contrast slider down a bit.