Keyboard Navigate Back to Perspective Top Level

I created a simple perspective to show all flagged or deferred actions (I prefer to work with start dates). When I open this perspective, the column immediately to the left of the sidebar shows the contexts, but none is selected, and all flagged and deferred items are available.

If I type Option-Command-2, and then down-arrow, the ‘No Context’ item is selected, along with its actions. Obviously, I can navigate with the arrow keys to just see those items with a certain context.

Now, after paging through the different contexts, how do I get back to the state where all contexts are visible, with the keyboard?

I hope there’s a simple answer and I’m just missing it!