How to reproduce:
1. Create a new HDRP project
2. Go to Window -> Package Management -> Package Manager (Window -> Package Manager) -> High Definition RP -> Samples -> Environment Samples -> Import
3. Go to -> Assets -> Samples -> High Definition RP -> 17.1.0 -> Environment Samples -> Environment.unity
4. In the Hierarchy, select the "Environement Sample Showcase" GameObject
5. In the Inspector, observe the description

Expected results: The headers are bigger than the main text
Actual results: The headers are smaller than the main text

Reproducible with: 6000.0.46f1, 6000.1.0b15, 6000.2.0a9

Reproducible on: macOS Sequoia 15.3 (M1)
Not reproducible on: No other environment tested