At the top of the overview screen are your favorites. If you click on one of the favorites you will reach the home screen (your first favorite).
The scanner is reachable by multiple routes. The first route is to click on the ‘Scanner’ button, located down in your home screen. From the overview screen, you can also click on the ‘scanner’ button in the bottom. At last you can also click on the plus icons from the categories. These icons are located in the top of the different sections in the overview screen.