Trying to find a particular style of full screen overlay menu for WordPress

I have searched and seen plenty of overlay or off-canvas menus for wordpress based sites but none that have the parent menu item on the left and the child menu items on the right as seen in this example site:
note: this is not a wordpress-based site but you get the idea what I am looking for.

If you know of something on code canyon that does this I would like to take a look at it.

Thanks in advance!