Please tell me how I can display the megamenu in mobile version.
In desktop I saw the menu, but in mobile I saw only parent category.
The mobile display cannot show the Mega Menu. For mobile, you must create a separate menu or use the Sidebar Menu Builder.
Can I import the mega menu in the sidebar because I have 300 links in megamenu.
No, there is no option for that. You must manually add menus to your Sidebar Menu.