The iPhone's default keyboard is designed to be compact and easy to use, but for those who prefer a larger keyboard, there are several ways to make the keyboard bigger on your iPhone.
Enable the One-handed Keyboard. If you're using an iPhone with a 4.7-inch or larger display, you can enable the One-handed Keyboard feature, which shifts the keys closer to one side of the screen for easier one-handed typing. To enable this feature, go to Settings > General > Keyboard, then toggle on the "One Handed Keyboard" option.
Zoom. In Another way to make the keyboard bigger on your iPhone is to zoom in on the screen. To do this, go to Settings > Accessibility > Zoom, then toggle on the "Zoom" option. You can then zoom in on the screen by double-tapping with three fingers. To adjust the zoom level, double-tap and drag up or down with three fingers.
Increase Text Size. Increasing the text size on your iPhone can also make the keyboard appear larger. To do this, go to Settings > Display & Brightness > Text Size, then drag the slider to increase the text size.
Use a Third-Party Keyboard. If none of the built-in options work for you, you can also try using a third-party keyboard app that allows you to customize the keyboard size and layout. Some popular third-party keyboard apps include Gboard, SwiftKey, and Typewise.
That's it! By following these tips, you should be able to make the keyboard bigger on your iPhone and improve your typing experience.