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(8) About the whiteboard: Click the icon
to check the version information.
(9) Exit the whiteboard: Click the icon.
When there is content on the whiteboard,
exit the whiteboard pop-up prompt: The whiteboard is not saved. Save the whiteboard
and exit the whiteboard. According to whether or not to carry out functional
operations; in the absence of content on the whiteboard, click on the whiteboard to
exit directly;