How to reproduce:
1. Open the attached user project
2. Select the “EnemyDesignerSkin“ GUI Skin (Assets/resources/GuiStyles/EnemyDesignerSkin)
3. Expand the Custom Style “Header1“ in the Inspector by clicking on the triangle left from “Header1”
Expected result: The Custom Style “Header1“ expands correctly
Actual result: The Custom Style “Header1“ expands incorrectly (overlaps the other Custom Style and becomes uneditable)
Reproducible with: 2021.3.3f1, 2021.3.4f1
Not reproducible with: 2020.3.38f1, 2021.3.2f1, 2021.3.5f1, 2021.3.8f1, 2022.1.13f1, 2022.2.0b5, 2023.1.0a6
Reproduced on: macOS (12.5)