Hello,
Your problem is resolved. As you want to remove the extra space in your mega menu. Actually by default the drop down contains the same height as same like the categories menu list.
So to change this I define a custom CSS class in your very first category menu item “controlHeight ” and then used the below CSS code in Theme settings >> Custom CSS >> Global Custom CSS:
.controlHeight .sub-menu-dropdown{
min-height: 0px !important;
}
Result: https://jmp.sh/rfZK8RC
Best Regards.