How to Change the Font Size on Stock Android Version 9.0 Pie?br br Step 1: Open 'Settings' App. br br Step 2: Tap on 'Display,' and then Tap on 'Advanced.'br br Step 3: Tap on 'Font Size.'br br Step 4: At the bottom, select the font size (small, default, large, largest) by using the slider. After you done, close the settings App.br br It's done.