A black separator appears when the left panel in the UI Builder tab is resized, and the tab is narrow
Unity: UI Toolkit Controls
Quality Hackweek
Open
6.7.X
6.6.X
6.5.X
6.4.X
6.3.X
6.0.X
Won't Fix
6.2.X
Unity 6000.2 has reached its end of life and will not receive further updates. If you need additional fixes, please upgrade to a newer Unity version.
How to reproduce:
1. Create a new project
2. Open the UI Builder (Window → UI Toolkit → UI Builder)
3. Dock the UI Builder tab next to the Inspector
4. Resize the left panel of the UI Builder tab (the left panel houses StyleSheets, Hierarchy and Library)
5. Observe the UI Builders left panel
Expected result: Resizing is smooth and no separation lines appear
Actual result: A black separator line appears, and the panel expands to fill the entire tab
Reproducible on: Windows 11
Not reproducible on: No other environments tested
Notes:
The issue depends on the size of the UI Builder window
When resized, you'd need to hover over the black separator in the middle of the panel to resize it again, not the border of the panel
Depending on the size of the UI Builder window, the left panel either resized minimally, completely covers the window or in rare cases, does not resize at all
This issue is not present in the Project tab when scaling the left panel
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