Any text that is in all UPPERCASE or lowercase can be changed by using the shortcut key Shift + F3.

Follow the steps below to do this using Microsoft Word.

1. Highlight the text that you want to change from uppercase to lowercase or vise versa.
2. Hold down the Shift Key and while holding down the Shift Key press F3.
3. Each time you press the F3 key while holding down the Shift Key it will switch that text from UPPERCASE to lowercase and lowercase to UPPERCASE