How to clear display settings cache
Solution 1:
Try deleting
/Users/YourUserName/Library/Preferences/ByHost/com.apple.preference.displays.\[long number].plist
replacing YourUserName and the long number with what you see on your system.
Reference
Try deleting
/Users/YourUserName/Library/Preferences/ByHost/com.apple.preference.displays.\[long number].plist
replacing YourUserName and the long number with what you see on your system.
Reference