The whiteboard feature is a helpful way to share information with people in a meeting while being able to add notes, edits, and changes to the screen. Other participants can also annotate the board if you allow them to. To use the whiteboard feature, you must join the meeting. From there, click on Share Screen and once you select Whiteboard, click on Share Screen again. The annotation tools will instantly become available. You can save your whiteboards notes as a PNG file once you are done with the meeting, if you want to do so.
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