This module enhances the Group module by allowing you to set permissions for individual groups, rather than just for group types. This provides greater flexibility and easier management of permissions across your site. It also offers revision history for permission changes.
Group module is a great solution for your community and other types of web sites, but it only allows you to set your permissions based on a group type. Group permissions module allows you to use group type permissions as default ones and completely override permissions on the a group level.
In this case:
1) It is not necessary to add multiple group types for every case when you need custom permissions
2) It is much easier to control permissions and the same time apply the same configuration for all your groups
3) It gives the full freedom to control your permissions per a group
4) it is always possible to restore default permissions
5) From alpha 4 we have support of revisions. So, you can see a history of changes
Group permission 1.0
If you face this error
InvalidArgumentException: $string ("") must be a string. in Drupal\Core\StringTranslation\TranslatableMarkup->__construct() (line 132 of /home/lob/www/drupal_group_1/web/core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php).
or this
Warning: Undefined array key "title" in web/modules/contrib/group/src/Access/GroupPermissionHandler.php line 183
Please apply this patch for Group module. Unfortunately, the author of Group module doesn't want to support Group 1.0 anymore.
Group permission 2.0
This release could be used for both Group 2.0 and Group 3.0