This is the detection of a potentially unwanted modification (PUM) on the registry that removes the Background tab from the Display Settings in Control Panel. Malware could apply this setting so the user cannot change the background it sets.
The following registry value data is modified:
Malwarebytes can modify this registry value data back to its Windows default setting without user interaction.
Also, we advise users to do a full system scan as PUM.Optional.NoDispBackgroundPage could have been added to the system by malware or a PUP.