Mega menu Html block not showing (HTML for dropdown )

Hello

I’m having this problem with my demo site . as am trying to add a mega menu, and at the first moment of me uploading the demo The mega menu was not working.

I tried several of your methods ( adding a new HTML block and saving the menu ), but nothing seems to add the extra custom fields from the theme.

I also tried to deactivate all plugins expect for recommended ones but nothing , i also tried and activated the parent theme and also nothing so if u can please help me that would be great