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The right pane of the tree editor doesn't resize to show all GUI components in the customizer displayed there. That means that when you select an element node, the element customizer appears in right pane, but the Up, Down, Remove, and Add buttons are off the screen. If user doesn't see the scroll bar at the bottom, they'll never know the buttons are there.
Solving as a part of more general bug. *** This issue has been marked as a duplicate of 19684 ***
VERIFIED
Resolved for 3.4.x or earlier, no new info since then -> closing.