
The Apple Watch screen is small. So small that it can be difficult for some people to read messages and other text on the device. Also, even though the Home screen icons get bigger when they are centered on the screen, you might find yourself accidentally tapping the wrong one more often than you'd like.
Apple has included a couple of accessibility features that make dynamic text larger on the screen, and there are options to make all of the icons stay big on the Home screen instead of shrinking and growing when they are not centered. We have a tutorial to show you how to enable these features.

Reduce Motion
The same feature that helps keep people from getting motion sickness in iOS 8 makes app icons larger on the Home screen on Apple Watch. It makes it a little bit easier to tap those tiny icons.
On Apple Watch, navigate to the Home screen and then open the Settings app.
Select General. Then scroll down to Accessibility.
Tap Reduce Motion and toggle the switch to the on position.
Or
Open the Apple Watch app on your iPhone and go to My Watch.
Select General, and then Accessibility.
Tap Reduce Motion and toggle the switch to the on position.
Now, the icons on your Home screen will remain at their fullest size instead of shrinking down as they move away from the center of the screen, as seen in the image at the top of this post.
Tip: If an app is centered on the screen, you don't even have to tap it to open it. Instead, rotate the Digital Crown to open the app. The hard part is being able to tell which app is centered.
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Article Link: How to Make Icons and Fonts Bigger on Apple Watch