Item Folder Properties - Group Memberships

Use the Group Memberships tab to grant users access to a folder. Users inherit permissions from the groups they belong to.

This tab is only available if the administrator has enabled the permissions-per-file feature. If enabled, you can grant group membership and access to a folder if you have the Assign group membership permission in your user profile. You must have Assign permissions in your user profile to grant permissions.
Users List of users in the group.
group name Controls access to the folder.