Some sites are still on the legacy "hamburger dropdown"
navigation_menu setting. In this case to avoid confusion,
we want to show both the sidebar icon and the header dropdown
hamburger when visiting the admin portal. Otherwise, the
hamburger switches sides from right to left for admins
and takes on different behaviour.
The hamburger in this case _only_ shows the main panel, not
other sidebar panels like the admin one.
Jarek Radosz
Martin Brennan