Is the Editor GUI currently in wide mode?
Wide mode is a mode for Editor GUI where the controls for structs such as Vector3 and Rect are inlined so they take up less vertical space. For example, in wide mode a Vector3Field takes up one line height instead of two, and a RectField takes up two line heights instead of three.
When creating your own multi-line controls, you can query wideMode and make the layout of your control follow the same logic.
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