How to Change the Keyboard to Uppercase Letter Keys on iPhone and iPad
One change made to the iPhone and iPad keyboard since iOS 9 is the introduction of a lowercased onscreen keyboard by default. Applying on iPhone and iPad, it can make it easier to identify when caps lock is enabled or disabled, but it can also be a bit more difficult on the eyes for some users, particularly on the iPhone with a smaller display.
If you’d like to revert back to an uppercase keyboard again, which matches the keyboard styling on the vast majority of hardware keyboards and the keyboard in all versions of iOS prior to the 9.0 release, you can do so through a settings adjustment.