Currently the designer loads the first page when you navigate into the designer and the user have no control over it. I suggest to load a page by default if it has the same name as the database (something similar to what we do for bookmarks) and fallback to the current behavior if no such exists.
Implemented with https://github.com/phpmyadmin/phpmyadmin/commit/1c52bc2a816621de1abea429cfa50aa5d9ce1d6b