Hey! I cannot find the switch to close the calendar. When I click on Visited: 321 days, 3 consecutive, it pop ups the calendar. But I cannot close it. (Is refresh the only way to close it?)
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There isn't any - the only way to get rid of it is to refresh or navigate to a different page.
As with other things which might be considered minor annoyances, the easiest way to get this functionality is to write a GreaseMonkey script for it.
Clicking somewhere other than the calendar seems to work for me as of now (Dec 14-13).