The default font size that is factory set on the Samsung Galaxy S5 Neo perhaps, may be too large or too small for you. Therefore you want to change the font size. We show you how this works in Android on the Samsung Galaxy S5 Neo:
Open the Android menu and then the system settings:
1. Now choose "Display" and then the submenu item "font" from
2. Change the font size via the slider from very small to very large
3. Confirm the selection of the font size by tapping on "Ok"
You should now use your desired font size on the Samsung Galaxy S5 Neo.