Thank you for your response. And yes correct it is defaulting to the AM radio screen at truck start up; the AM app covers the entire screen with preset station buttons. I have never used the AM radio before. And yes also no nav tile shortcut at the bottom so I have to go through the menu to get me back to nav. Now I have a set number of chores every time I drive... 3 clicks on the screen to get me into Sport mode and another 2 clicks to get me into Nav. I wonder what Ford will add to the pre-drive check list next.I frequently have to reload the navigation app even though it was the last thing displayed. It's not even in the lower tile row of last used apps.
To confirm - you're not saying it is switching to AM radio from some other source of music, right? I assume you are indeed listening to AM radio and have navigation on. If it's switching from FM or BT or CarPlay to AM radio then that's a different issue. I've never experienced that.