UberMenu will automatically display Right To Left when the .rtl class is present on the body tag.
Top Level Item Positions
In the UberMenu Control Panel, leave the Menu Item Alignment set to “Automatic” or “Flex” to inherit the text direction automatically.
Submenu Position
In the individual item settings, you can change the Submenu Position, for example to align to the right edge of the parent item
RTL text alignment and columns
LTR
RTL