Lumiera/GuiBrainstorming/MenuAndShortcuts should explain most heavily discussed GUI features being related to Lumiera’s GUI.
popping up on click
look like 1-9 on a numpad
mouse is located at 5
1-46-9 are the items: click here to access them
if a item is the entry to a second menu the mouse will be at 5 of the new menu
5 is cancel
as Version 1
popping up as well on pressing 0 on keyboard
use numpad to navigate through the menus
all functions can be accessed using this menu