back button should return to home screen

When going to any specific window (ie About) after launching the app, I expect that the back button (<) will return me to the overview, however it closes the app. I need to use the 'hamburger' at the top left to get where I want to go. Is this desired behavior? Is it possible to change this and/or to get a confirmation dialog that I really want to close the app? It´s also very valid to say the issue I´m reporting isn´t a 🐛 😉