Accessed by selecting ‘Group configuration’, under the Administration tab on the group dashboard, these are values that control various aspects of group behavior such as whether returned email messages are forwarded to a nominated address. While these same values can be set at the project level, the rules of inheritance and overrides can prove confusing for new users.
Experiment with the group properties on a development server before making changes to a production server.
Group properties are part of the group configuration. See API Documentation: Group Properties for inheritance and additional details.