Animation in side menu

Hello people!
I’m new on Webflow and webdesign at all. I’m trying to do a side menu that moves to the left (100% VH and 50% VW) when clicks to the menu button. And after, a button appears to close.
I really enjoy to learn in all webflow videos and I already did great stuff using it!

But now, I can’t understand how a menu stays “invisible” inside de canvas, because everything changes the position when I make some change. I saw something like a move transition, but I didn’t get the point.

Can you help me?

Here is my public share link: Webflow - ElenF1
(how to access public share link)