Prevent changing start menu background

Prevents users from changing the look of their start menu background such as its color or accent. By default users can change the look of their start menu background such as its color or accent. If you enable this setting the user will be assigned the default start menu background and colors and will not be allowed to change them. If the “Force a specific background and accent color” policy is also set on a supported version of Windows then those colors take precedence over this policy. If the “Force a specific Start background” policy is also set on a supported version of Windows then that background takes precedence over this policy.