Edit default dashboard

To modify anything on the default dashboard (Overview) one has to assign another DB as default. I would like to modify de default DB as “Admin only”.
I assigned another DB as default (Lars). Nevertheless the windows that opens for editing DB Overview (not anymore default) says one has to assign another DB as default:

On the other side when clicking on Lars (now default) would allow to modify the Admin Only switch.

May i use raw edit to change that?