How to reproduce:
1. Create a new Unity Project
2. Right-click in the Hierarchy -> Effects -> Particle System
3. Select the created GameObject
4. In the Inspector, under the Particle System, select and enable "Size Over Lifetime" property
5. Click on the "Size" curve and navigate to the "Particle System Curves" preview
6. Narrow down the Inspector so not all presets are visible there
7. Observe the results

Expected results: The presets can be scrolled and there is an indication that not all presets are shown
Actual results: The presets can't be scrolled and there is no visual indication that not all presets are shown

Reproducible with: 2022.3.56f1, 6000.0.34f1, 6000.1.0b1

Reproducible on: macOS Sequoia 15.1 (M1)
Not reproducible on: No other environment tested