Posted in order to provide the answer.
Can the menus (titles of menus with options) be hidden behind one single button?
I see that at least in some of the "User interfaces" (a newer feature that can be enabled as "experimental" under Tools>Options>Advanced>Enable experimental features - and then user interfaces can be switched from View>User interface) this option is present either as a button or as an option among the "Menu" options.
e.g. with the "Tabbed" UI:
with the "Groupedbar" UI:
But I cannot find this with the standard UI, which I prefer.





