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Preventing O365 Group members to edit site navigation and pages...
1. How can I achieve subject issue?
2. Prevent users to delete files/folders from O365 group "Documents" page
Please note, if the current permission levels (Full Control, Read Only, etc) don't match your needs, you can créate a new one from that same page (there's a button on the Ribbon: Permission levels), but don't edit default levels, otherwise the change would affect all sites.
Site settings -> Users and permissions -> Site permissions
There you will find all groups with permissions on the site. Change Group permissions and/or move members from one Group to another with more restrictive permissions.
https://support.office.com/en-us/article/understanding-permission-levels-in-sharepoint-87ecbb0e-6550-491a-8826-c075e4859848
There you will find all groups with permissions on the site. Change Group permissions and/or move members from one Group to another with more restrictive permissions.
https://support.office.com/en-us/article/understanding-permission-levels-in-sharepoint-87ecbb0e-6550-491a-8826-c075e4859848
Please note, if the current permission levels (Full Control, Read Only, etc) don't match your needs, you can créate a new one from that same page (there's a button on the Ribbon: Permission levels), but don't edit default levels, otherwise the change would affect all sites.