Waiting: can I leave?

It would be helpful to know, whether I can swap to a different tab or whatever. Especially while the navigator is being created. it's fine that it takes five minutes, but it would be nice, if it said: you can leave and come back later, OOOR not because then everything is deleted :D In. case I can leave, it would be cool to have a pop-up that says, "Ding" your Navigator is ready, otherwise I might forget. Just like a microwave haha