When you need to keep track of a specific group of users, it is useful to assign those users to an admin. But what happens when that admin is no longer a part of your staff? That responsibility and those users need to be transferred to a new admin before you kick out the old admin.
First, head over to your Users section.
Second, click inside the “search” field and start typing in the current admin’s name. You will want to filter for all the users assigned to that admin before you remove them, so you can re-assign them to your new admin.