I just tried how the post approval process works. After posting twice from a test account, the admin got a little 2 flag on the menu. Clicking this number opens the flag view:
2
I think that when there are no pending flags, clicking the number should open the pending post view.
I am not sure if this should even go directly to flags ever, its such a tiny click target needs ninja skills,
Instead it should probably just expand the hamburger.
This has been resolved in the current UI. Thanks all!