Changing Users' Rights

Making a User an Admin

This process assumes that the 'Admin' role has already been created.

Select 'Enterprise applications'
Select the application from the list displayed in the body of the screen
Select 'Manage > Users & Groups' from the menu
Click 'Add user/group' (No need to select user at this stage)
Click 'None Selected' (in this case)
This will open a pane to the right. Tick the users you want to assign to the role. Click 'Select' at the foot of the pane.
In my case only 'Admin' was available as a role and was selected automatically.
Click 'Assign'

Log into the Azure Portal
Change directory to the one containing the Entra External ID
Select 'Microsoft Entra ID' from Azure Services
Or enter 'Entra' in the search bar
Select 'Enterprise applications'
Select the application from the list displayed in the body of the screen
Select 'Manage > Users & Groups' from the menu
Tick the user you wish to remove Admin rights from - make sure you select the user with Admin 'Role assigned'.
Click 'Remove assignment' on the toolbar.