To remove highlighting from the document you are editing, follow these steps:
Either select the text you want to remove highlighting from using your cursor, or press
Ctrl A (Meta A on OS
X)
if you want to select all of the text.
Click the small arrow next to the Highlight icon and select
No color (erase), or right click the highlighted content and
select Remove highlight(s) (or select the action from the Edit > Review menu).
The highlighting is removed.
Click the Highlight icon to exit the highlighting mode.