To Deactivate a Team Member:
From the Dashboard, go to Settings > Team.
Click on the name of the user you'd like to change
3. At the bottom of the the overlay, click "Deactivate User"
Projects belonging to a deactivated user will be reassigned to the first admin user in the company once deactivation is complete.
To Reactivate a Team Member:
From the dashboard, go to Settings > Team
Find the user you'd like to activate under the 'Deactivated Users' section, and click "Reactivate User"
Hope this helps - let us know if you have any questions!