I used to have a hierarchical menu at the top left, that let me launch applications, similar the old-fashioned Windows start menu. The nice thing about this is that one may organize the launchers, instead of having all at the same level, as in the Dock. In Unity, for instance, Drawers intended to allow for a similar capability.
How can I get this menu in Ubuntu 20?
I know I can simply search for an app in Activities. The menu I am referring to is not a replacement for that, but complementary. In this menu, I can explore what is available, in an organized manner.