Unlike a regular Windows PC or Mac OS computer, you can't change the screen resolution of your Nexus 7 tablet. With accessibility feature, you are able to make the text larger or smaller. But it will not be working unless you try zooming in or out the screen. To change font size on Nexus 7 tablet, you can easily do that from the Setting.
* From your tablet's home screen, touch Settings 》 Device 》 Display.
* From there, you will see the font size option. Tap on it to change as you need.