So, if I want a background animation for menu.. i.e. a part of the game, do I need to use a "world" to make the menu? I have only five world available, so kind of sad to use one of the world "only" as a meny-design... Look at attached example I found...
IN the above example yes it was created using a world. There are some unknown tricks (at least not available to community as of yet since they are still in development) for your issue. My suggestion is to use a pre rendered animation sequence to achieve the same results in the UI. In other worlds export the animation as pngs and use them to render what you need. As a note: do not export the hole screen at once, because this way you will fill out multiple atlases for no reason.