Files and projects can be shared with collaborators or with Members of your Studio.
Once you're done collaborating with a user, you can remove them by clicking on 'Collaborators' in the left navigation menu within your Project,
Finding the collaborator you wish to remove in the list and clicking the menu icon next to their name, then 'Remove.'
Note: If you have paid studio collaborators included in your subscription, removing them from specific projects will not remove them from your plan. If you wish to remove a paid collaborator from your subscription please consult the article on Adding & Removing a Paid Studio Collaborator.