How to reproduce:
1. Create and open a new project
2. Open the UI Builder (Window -> UI Toolkit -> UI Builder)
3. Add any element to the Viewport (for example a Visual Element)
4. Resize the window so the rightmost vertical scrollbar disappears
5. Expand any foldout element under “Inlined Styles” in the UI Builder Inspector
6. Resize the height of the UI Builder window, making the window smaller
7. Collapse the foldout element previously expanded in step 5
8. Try scrolling down to the bottom element in the UI Builder Inspector
9. Observe the result

Expected result: The bottom elements are reachable
Actual result: The bottom elements are not reachable

Reproducible in: 2021.3.44f1, 2022.3.47f1, 6000.0.20f1

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

Note: Reproduction can sometimes be inconsistent, but should reproduce within a few tries