This guide will help you learn how you can change the icon size on your Galaxy S8 app home screen.
To start off, you will need to have your home screen open to edit mode on your Galaxy S8. You should put a finger on your home screen to start this.
Once you are at edit mode on the home screen, click on the option for screen grid that is at the lower left corner of your screen. There are actually three sizes that you can have for the screen on your Galaxy S8 such as 4×4, 4×5, and 5×5. You can fit more apps on one screen on your home screen if you have a large screen grid and the app icons will be smaller. The same is true if you have a small screen grid, the app icons will be much larger.
After you have picked the size of the screen grid that you like, click the apply key. You will see the new changed size for the app icon on your home display on the Galaxy S8 or Galaxy S8 Plus.