To remove the admin from the any of the existing Franchise please scroll down to "Platform > Settings > Admin Users > Admins > Search for the admin" and click on the admin name.
Scroll down to remove the Franchise associated to the admin by doing a click on cross option and click on Update. Now the Admin will not be a part of any Franchise.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)