Hi @Roger Roger,
You can check the permission the user has via:
- Click on Gear Icon > Site Settings
- Under User and Permissions, choose Site Permissions
- In the top ribbon, choose Check Permissions
- In the User field, type the user’s name and click Check Now
- You will now see what kind of permissions the user has on a site
If you want to revoke permissions, just go to the location as shown in "Given through" and delete the user in those group or files.
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