Used Smart Menus script for this, so some notes while I remember them
Hestia has position menu to the right with navbar-right
but using this class causes that 3rd and 4th level are going to the left side (like RTL).
Without class navbar-right menu items are displayed on the right side.
So for combination right navbar and submenus on the left - class navbar-to-right is used in header template (the same style as navbar-right but smartmenu script doesn't detect that you want to submenus on the left side.