How to reproduce:
1. Open the attached project “UIBuilder”
2. Click Edit → Preferences → General → Editor Theme → Light
3. Open “Level Editor GUI.uxml” in the Assets folder
4. Drag objects around in the Hierarchy
Expected result: Dragging in the UI Builder Hierarchy looks the same as Unity Editor Hierarchy (when dragging an object, depending on the position, there are blue stripes upon and above the other game object, which indicates where the object will be placed)
Actual result: There is no way to know where the object will be placed as there is no visual feedback
Reproducible with: 2021.3.6f1, 2022.1.9f1, 2022.2.0b1, 2023.1.0a3
Could not test with: 2020.3.36f1 (“Level Editor GUI.uxml” can’t be opened)
Reproducible on: Windows 11 Pro
Note: This issue is not reproduced on the dark theme