Look at first to deactivate Bedroom Mode Feature which is explained in the link below.
Look at Settings, Battery and Device Care, Battery, Battery Saving and Toggle Off.
Further information here Samsung mobile-devices/how-to-troubleshoot-when-the-samsung-phone-display-is-unexpectedly-grayscale.
Daily Driver > Samsung Galaxy s²⁵ Ultra 512Gb ~ Titanium Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "
