How to reproduce:
1. Open the attached "1259361.zip" Unity project
2. Open the Project Settings > Physics window
3. Resize the window to make it small and scroll around vertically and horizontally

Expected result: the labels are hidden when scrolling away from them
Actual result: the vertical labels overlap with the rest of the UI (left side-bar, scrollbars, search bar)

Reproducible with: 2018.4.24f1 (see note 1), 2019.3.16f1, 2019.4.2f1, 2020.1.0b14, 2020.2.0a16 (see note 2)

Notes:
1. In 2018.4.24f1, the labels only overlap with the scroll bars, though not other UI elements.
2. In 2020.2.0a16, some labels may also disappear or get scrolled vertically. If the Project Settings window is resized horizontally, off-screen labels will disappear when the window is scrolled to the right.