When a new SharePoint Online site is created it comes with 3 default permission groups.
- Owners – Full control permission
- Members – Edit permission
- Visitors – Read permission
These are setup as default permission groups. Users in Owners group have the ability to receive and approve/reject access requests. This can be setup through ‘Access Request Settings’ option in ribbon under ‘Site Settings’ -> ‘Site permissions’.
Default Owners group will show up in Access request settings as an option to receive requests. If you by mistake delete default permission groups or end up managing a site without default groups (happens a lot if your site was migrated from previous versions of SharePoint) you can recreate default groups by accessing below link directly –
You can also accomplish this by setting any group as default in group settings -> Make default group.
Members group is setup with Edit permission. Only & dangerous difference between Edit & Contribute permissions levels is that users with Edit permission have the ability to delete lists/libraries. It is up to you to decide if you want to leave it as Edit or change it to Contribute, which still provides users with capability to delete list items but not lists.