Hello A0802,
Thank you for visiting Apple Support Communities.
It seems like your iPhone 5s screen is zoomed in, and you're not able to zoom out. If you can't access the Settings app on the iPhone, try connecting your iPhone to iTunes and using this option:
- Connect the device to any computer with iTunes.
- Select the device when it appears.
- Select Configure Accessibility on the device summary page:

- Select Neither to disable zoom:

- Click OK.
From:
iOS: Home screen icons are magnified or large
You can also find this setting on your iPhone by going to Settings > General > Accessibility to see if Zoom if it is enabled there, as mentioned in Use Accessibility features in iOS.
All the best,
Jeremy