Try it!
If you change the formatting of text or images and then decide you don't like it, you can undo it.
Undo formatting
Select Undo 
Clear All Formatting
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Select the text with the formatting you want to clear.
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Select Home > Clear All Formatting
Reset Picture
If you made changes to a picture and later want to undo the changes:
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Select the picture.
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Select Picture Tools > Format.
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Select Reset Picture.
