Reproduction steps:
1. Create a new project
2. Create > Shader > Shader Variant Collection
3. Click on newly created Asset
4. Add several Shaders in the Inspector
5. Add keywords to the Shaders by pressing “” button
6. Observe the Inspector

Actual result: It's difficult to distinguish which "" and "-" button belongs to which Shader or keyword due to unclear UI separation
Expected result: Each Shader is separated and it's easy to understand which button belongs to which Shader or keyword

Reproducible with: 2022.3.68f1, 6000.0.62f1, 6000.2.12f1, 6000.3.0b9, 6000.4.0a4

Reproduced on: Windows 11, macOS Sequoia 15.4 (M4)