How to reproduce:
1. Open the attached project “IN-135270”
2. In the Project window, open the “Assets/Scrollview” asset
3. In the UI Builder window, observe the Viewport

Actual result: Gaps are visible between the elements inside of the ScrollView and the borders
Expected result: No gaps are seen between the elements inside of the ScrollView and the borders

Reproducible with: 6000.3.0a3, 6000.3.10f1, 6000.4.0b10, 6000.5.0a7
Not reproducible with: 6000.3.0a2
Could not test with: 6000.0.68f1 (Filter dropdown is not available)

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Note: Location and appearance of the gaps depends on display scaling