Issue with primary/mobile menu

Hi.

I hhave installed multisite language switcher to my multi site and added a mslsmenu plugin. My site use an Astra Thame. Everything is fine and working, but I cannot set the Translation flags in menu into primary and mobile menus. If I set to primary, then it is visible on PC, if I switch to mobile (in setting only place where menu is named mobile – is multi site setting), then on mobile menu flags are visible but not in PC. What should I do, so there and there will be possibility to choose language ?

The page I need help with: [log in to see the link]