Steps to reproduce:

1. Create a new Unity project
2. Install the "Asset Manager" package
3. Open Asset Manager window (Window -> Asset Manager)
4. Add a few assets
5. Select any asset in the "Assets" window and observe the window buttons
6. Go to the "Upload" window
7. Drag in few assets
8. Select any asset and observe the "Add custom field" button

Actual results: "Add custom field" button appears narrower than standard "Asset Manager" window buttons
Expected results: All buttons should look the same

Reproducible with versions: 1.5.1, 1.6.0, 1.7.0 (6000.0.58f1, 6000.2.6f1, 6000.3.0b3)

Tested on (OS): macOS - Sequoia 15.6.1