When you click a top-level menu in v11 - such as "Applications", "Configs" or "Web" Orion paints up the Summary page for that module, but on v12 there is no link from the top level menu, only from the contents of its pop-up menu-bar. Expanding the dashboard gives an approximation to the v11 functionality because the top-level menu is now invisible, but with a lot of modules installed it is a huge menu area.
Most of the time I would flit around summary screens before diving into a chain of diagnosis and having links-to-summary-pages available from the top-level menu would save a lot of re-positions & re-clicks.