When you create a new user, you can to apply a theme to all the administrator accounts, or allow admins to choose their own theme
To enable themes per admin:
- Go to Admin > Administrators.
- In the toolbar, click Create New. The New Administrator page is displayed.
- Set Theme Mode to Use Own Theme.
- From the User Theme menu, select a theme.
- Click OK.
When a user logs into their account, they can change the theme by clicking their username, and selecting Change Profile.