I have just tried without success to find any reference to the Menu editor in the X3 manual.
In the old Sonar 8.5 help manual it comes up when you search for “Customizable Menus” or “Menu Editor”. It used to be found under Options.
As the term “customizable menus’ suggests, it’s where you can customize any menu list in Sonar – like hiding menus you never/seldom use, or bringing go-to menus to the top of the list, etc.
Is this option still available in X3?