What is icon autofill?

The Icon Autofill option automatically rearranges icons to fill the screen from top to bottom. How to Enable App Auto-fill Samsung: Open your settings app, tap "Home Screen & Screen. Icon Autofill: Enable this toggle if you want the app icons on homescreen to be auto arranged; keep it disabled if you want to freely position app icons. Tap the Login icon to copy your login to the clipboard. Most Android apps will likely begin adding the Autofill functionality to their apps.