UI Toolkit Horizontal scroller resizes and moves left based on the vertical scroller position

Unity: UI Toolkit Controls

6.7.X

6.6.X

6.5.X

6.3.X

6.0.X

Steps to reproduce:

Open the "UiToolkitUXIssue.zip" project
Open the "SampleScene"
Open the 'Window -> UI Toolkit -> Debugger' window
Enable 'Pick Element' in the UI Toolkit Debugger
Select the top left square in the Game view
Select the second-to-last item in the UI Toolkit Debugger (because of another bug)
Scroll to the top and observe the horizontal scroller

Actual results: The scroller is to the left of the Hierarchy and is big (or it's hidden)

Expected results: The scroller is to the right of the Hierarchy and is of the same size

Reproducible with versions: 6000.0.0f1, 6000.0.80f1, 6000.3.20f1, 6000.5.5f1, 6000.6.0b5, 6000.7.0a3

Tested on (OS): Windows 11 Pro (25H2)

Notes:

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