I recently had occasion to refer to the Help Center for a stack on which I did not have review queue privileges. On such stacks, the Help icon is next to the hamburger, as shown:
However, on a stack on which I do have review queue privileges, I wished to provide a new user with a link to the Help Center's on-topic page for the stack, to assist in explaining why I flagged the question as off-topic. I had to hunt around for the link to the Help Center at the bottom of the page, because where I have review queue privileges, there's no help center link on the top bar:
I believe that the Help Center link should remain available even if the user has review queue privileges.