Nicepage 5.8.2 - I can't figure out your Mega Menu, days on this for nothing

I select add a menu and make it a single menu, in the style preset I select the very bottom one that has an image in the mega menu. I select the [width] after selecting [Mega menu] and set it to "sheet".
A: it only works on the first menu item
B: you try to edit it in anyway you lose all changes, edit any of it, the menu, the sticky header anything at all
C: super frustrated with Nicepage already