You can find this option in Appearance > Menu > Select menu > enter menu item > Custom fields [for theme] which appear as soon as the menu item has been saved, find Open on mouse event – allows to set hover or click event on menu item, in result Mega menu block would appear on hover
I think we are not on the same page , Please look at picture in link
In normal page like product page category bar will auto hide when not hover mouse. but in my landing page this menu always show not only hover but also not hover too. I want it show list only when hover .