How do I make my mega-menu open/stay open on hover instead of having the arrow drop downs and also for the lower mega menu not to stretch the entire length of the screen and only show below the menu-item itself and as wide as the lower menu items? Here is my website and I am using the Trade Theme.
To change behavior from click to hover you can check setting on theme that can be support to switch status.
About issues the mega menu not stretch you can use css to make it same width as like parent menu.