Windows: Highlight the text whose case you want to change and in the Home ribbon, click the All Caps icon:
Note that although the icon is called All Caps, if the selected text is in all caps, clicking this icon will convert the text to lower case.
Mac: Highlight the text whose case you want to change and on the keyboard press Command + K or go to Format > Toggle Case. You can also add the Styles icon set to the toolbar (View > Customize Toolbar); this icon set contains the All Caps icon.
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