The Easy Way to Change Between Uppercase, Lowercase, and Title Case.

In Microsoft Word, you can use the keyboard shortcut Shift + F3 to change selected text between uppercase, lowercase, and title case.

Highlight all the text you want to change. Hold down the Shift and press F3. When you hold Shift and press F3, the text toggles from sentence case (first letter uppercase and the rest lowercase), to all uppercase (all capital letters), and then all lowercase.