How to reproduce:
1. Create a new project and open it
2. Open the Preference Window (Edit -> Preferences... -> General)
3. Enable the "Verify Saving Assets" option
4. Create a new scene, make changes and without saving them try to close the Editor (A Save Assets Window should appear with the unsaved scene changes)
5. Observe the Scene icon in the Save Assets Window

Expected result: the assets and its icons in the list are reasonably sized allowing for multiple assets to be shown without scrolling
Actual result: the asset icons are very large allowing only a couple of assets to be shown at one time

Reproduced in: 2020.1.0a12, 2019.3.0b10, 2019.3.0a12
Not reproducible in: 2019.3.0a11, 2019.2.12f1, 2019.1.14f1, 2018.4.12f1