Can an app have dashboard menu as a first screen?

I'm designing an app for pharmacists and their clients. The app holds many options and the pharmacists would like their clients to compose their own menu. For now i have a tabbar menu with 3 options and a more option which opens up a list view of the other options.

My question is:

• Can I present the user with the list view as the first screen?
• If so, the tabbar is also visible but which menu option should be enabled? I assume the 'more' option but it seems strange to highlight the 'more' option as last one in the tabbar on opening the app. It feels like the first one in the tabbar is usually highlighted.
• I have a discrepancy here with the navigation bar, I don't quite know which label it should have + it has the profile and notification option visible, while they are no longer visible when a user clicks on the 'more' option later on. Because normally the user then only needs a 'cancel' option to close the list view

Any feedback is welcome. Thx