Go to Users > Manage Shared Identity from the side menu.
On the Manage Roles page, you will see all users having an end user role on the left hand side in the END USERS panel and
users having an additional admin role on the right hand side in the Admin Panel. To make user additional admin, select the user in the left side section and click on the Add button.
Click on Save to change the role of selected user/users to additional admins. Now the next time that user initiates login to the dashboard, they will be redirected to the admin dashboard instead of the end user dashboard.
On the top-right corner, click settings icon.
In the settings page, use the search bar to type shared.
Click on Enable Shared User Login for users.
Click the save button in the top-right corner.
How to change the role of user from Additional Admin back to End-user:
Go to Users > Manage Roles from the side menu.
On the Manage Roles page, you will see all users having an end user role on the left hand side in the END USERS panel and users having an additional admin role on the right hand side in the Admin Panel. To make an additional admin a end user, select the additional admin and click on Remove to change the role of the selected user back to end-user.