You can’t delete (or add) users directly in SignatureSatori.
In order to remove users from the app, you need to
- Delete them in G Suite and then click “Load new users from G Suite” in the Users menu.
2. You'll be now prompted to confirm your choice.
3. The synchronization will now be performed, new users will be added and the ones deleted in G Suite displayed above the list of Users awaiting your confirmation:
4. Voila, the user's gone!
You can find more information about Reload modes here