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As in Pose Mode, the idea here it to try to reduce viewport complexity without requiring users to turn off the overlay completely all the time. For example, a background prop (e.g. a tree with a tyre hanging off it, or a branch with hand-placed leaves) won't be cluttering the viewport with its relationship lines all the time, when you're trying to do something else. When you really do need to see these lines, you can still select the object in question, and you'll see the lines for which objects are its children or what its parent is. And to see all lines, you can still always select all objects.