BUG: UISizeBy doesn't work. Use SetSizeWithCurrentAnchors instead of size delta.

[Tymski]

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You set size delta instead of using the SetSizeWithCurrentAnchors method. This doesn't work on the majority of anchor settings.

Any stretching on anchor settings will break your code in half.

https://docs.unity3d.com/ScriptReference/RectTransform.SetSizeWithCurrentAnchors.html