How can I hide the Task sidebar in Evolution calendar?

I would like to hide the taskbar on the right shown in Evolution Calendar.

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You simply have to drag the window divider over to the right while the Evolution window is not maximised:

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This setting will be retained on restart. Oddly enough to revert these changes you can only easily drag the window open when Evolution is maximized, although I suspect that this is a 'feature' of the Unity Desktop's handling of scroll bars and I have found that with a steady hand this can be circumvented:

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Curious...