Bigger Font size & display size

You can change your font size and display size to make your screen easier to view.

Whether you're suffering from eyestrain or increasing age-related farsightedness, there are times when being able to increase the size of the text on your phone, tablet, or laptop makes all the difference. I know because I've been taking advantage of the zoom and text-enlargement features on all of the devices I use and test for the last few years. Fortunately, it's easy to enlarge text without increasing the size of your screen or zoom in the whole screen. Here’s how you can make your smartphone, tablet, and laptop more readable.

Install this app to display larger text in various apps, get arger Text, and then turn on “Larger Accessibility Sizes.”
You can also drag the slider on that page to adjust the overall font size. Under Display & Text Size, you can toggle on and off "Bold Text" or "Increase Contrast" all of which may make reading the screen easier on your eyes.

To magnify your entire screen, use this app, its very easy to use.