To check if there is Custom Group Page Access:
- Navigate to Core > Security > Group Page Access > Select the appropriate group type (such as Classes, Activities etc.)
- Depending on which group type you selected, select Individual "Group Name" (for example Individual Classes, Individual Activities etc.)
- From the drop down to the right right of School Level, that is titled based on the group type such as Individual Classes, locate the group, but do not select it (as that would actually add the (C) custom setting.
Then, it will follow the default settings as found within the School Levels Button within that Group Type: