The TouchWiz launcher lets you change font size on Galaxy S7 (Edge), as well as the font style. To change font size on the Samsung Galaxy S7 and S7 Egde, do as follows:
1. Open the Settings app
2. Scroll down to the orange icons and go to the Display settings
3. Now, under the Brightness slider, tap the Font option
4. First you get to change the font size on S7 from Tinty to Huge
5. And then you can change the font style and select a new font from available options: Choco cooky, Cool Jazz, Gothic Bold, Rosemary and more fonts are available in the Play Store and you you can easily download them.