I remember a tutorial to setup the UI, so that it stays on the same position of the window, while the platformer character scrolls through the whole layout, but I can't find it anymore.
Can someone please tell me where to find it or help me with this problem?
So far my character has a scroll to behavior, this is all.
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Select the GUI layer. In the layer properties, select 0,0 under Parallax. That should give you the effect you need.