Hi ​@James Whitley, 

Welcome to Box Community and we’d love to walk you through in changing your Admin and removing the Admin’s access to folders. 

Since the Admin is no longer with your company, let me clarify are you eyeing to remove the current Admin’s access to the folders and transfer the Admin privileges to another user?

If the Admin is an existing collaborator. Reach out to the folder owner to end the user’s access to folders and here how to remove the collaborator's access to the folder. 

Meanwhile, to change Admin please follow the instructions below: 

Requirements

• This task can be performed only by the current Box Admin for your organization, logged in as the Box Admin.
• If you have at least one verified domain, then the email addresses of both the current administrator and the managed user who will be assigned the Admin role must be members of those domains.

1. While logged in as your organization's Box account Admin, go to Admin Console > Users and Groups.
2. Click the Managed Users tab.
3. Click your Admin account in the list of users (it will have the value Admin in the Role column).
4. In the Role and Access Permissions section, click Edit.
5. In the Role field, click the Change Account Admin link.
6. In the Select Your Role field, select a new role. You can either set yourself to be a Co-Admin, which will allow you to retain some administrative control of the account, or as a general user on the account, which will remove your access to the Admin Console.
7. In the New Admin field, enter the name of the managed user that will be the new Box account administrator.
8. Click Save Changes.

The existing administrator will receive an email notification to verify the change. The admin transfer will not occur until verified by the existing admin.

Note

• If your previous admin has left your organization and you do not have access to their Box account, you will need to submit a support ticket to first authorize your request.
• Please refer to Admin Transfer Protocol for Departed Admins for more information.

If you have clarifications, please feel free to reply. 

Thanks for posting!