Animate menu / menu container


I must be stupid, but I cant find how to animate the menu transition (I want the menu to fade in)
I found this page that clearly describes how it is done, but the option simply isnt there

The tutorial is for editor X and I am using Wix Studio. Perhaps the option is elsewhere in Studio?

Create a lightbox and add trigger in hamburger menu icon and set the trigger to open lightbox. (disable the lightbox auto open option in lightbox option).
And add entrance animation to lightbox (Fade In)!. Similar steps like the Editor X!