There are a couple of different ways of doing this. Run the video below to see how it’s done. (Use the full-screen option if required.)
TIP: Since the September 2016 Anniversary Update, ‘All apps’ are shown by default, so no need to click. In Tablet Mode, you can switch between the Start Screen (showing your tiles) and an All Apps screen, using the icons in the top-left of the screen. This is shown in figure 1-6 below.