Hello Pinki

Please follow this documentation

Best regards

Please follow this documentation

Offcanvas start work, but submenu don't opens o_0'

Hi, because you used "Separator" as main menu items, this shouldn't be used like that.

Please read tip #7 from this same documenation link

And menu work some weird. From PC in Firefox in adaptive mode menu not open. From Samsung phone in chrome browser not open. From Xiaomi, Iphone work normal, from Huawei offcanvas menu align left, but I write css to align offcanvas to the right.

If we talk about MegaMenu (not Mobile Menu) as I tested so far it works in Firefox, Chrome.

If we talk about MegaMenu (not Mobile Menu) as I tested so far it works in Firefox, Chrome.

I talk in this topic only about Mobile offcanvas. Megamenu work much better, but too have some glitch, maybe later ask about it. For now I try mobile menu.

Firefox (Tablet view) - Mobile Menu

All menu items are open by default becuase you used extra custom CSS for it. But if you want to open-close them you have to change menu item type from Selector to URL, as I gave you tip from documenation.