When using CanvasGroup in Studio, the resolution is very low when using ZIndexBehavior Sibling. When switching to Global, the resolution increases but there are severe visual artifacts. Both ZIndexBehavior modes appear properly when used in-game.
Two videos of this issue on different screen sizes:
Expected behavior
The resolution should be the same in both ZIndexBehavior modes. When resizing in either mode, there should not be visual artifacts.
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