In Unity5+, are we supposed to get rid of the old UI gameobject and place all the UI elements under a Canvas GO? Buttons only seem to work with the latter setup; but I’m getting confusing results. A search didn’t help.
I suggest you start by going through the tutorials first:
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All UI elements need to be under a Canvas. Creating a UI element without a Canvas in a scene will automatically make a canvas, so usually you won’t even need to make one manually, unless you need multiple canvases. I recommend doing the tutorials linked above.