How to configure user and post permissions in a group
Click the three dots (...) icon near the group header.
From the dropdown, click Settings.
In the pop-up, go to the Permissions tab.
Set permissions to allow everyone, admins, specific users, or specific roes to perform certain activities.

Managing built-in apps in a group
In Connect, you have multiple built-in Connect apps dedicated for groups, such as events, custom apps, manuals, and boards.

Only the group admin can enable/disable the apps in a group.
How to disable and enable apps in groups
Click the three dots (...) icon near the group header.
From the dropdown, click Settings.
In the pop-up, go to the Apps tab.
Toggle the button on the right side of each app to enable or disable it.