When you press Shift+F3, a pie chart comes up in the bottom right, and is supposed to go when you press F3 again. However, it remains even after closing the F3 menu. Even quitting to the main menu does not get rid of the chart. To get rid of it, you have to restart Minecraft by closing it and opening it again.
Thank you for your report!
We're actually already tracking this issue in MC-170816, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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