This policy controls the Compatibility View feature, which allows users to fix Web site display problems they may encounter ...

This policy controls the Compatibility View feature, which allows users to fix Web site display problems they may encounter while browsing. 

If you enable this policy setting, users will not be able to use the Compatibility View button or manage the Compatibility View sites list. 

If you disable this policy setting or do not configure this policy setting, users will be able to use the Compatibility View button and manage the Compatibility View sites list.