Steps to reproduce:
1. Create new Unity project
2. Import Terrain Tools package
3. Open Terrain Toolbox window (Window > Terrain > Terrain Toolbox)
4. In Terrain Toolbox window press “Create” button
5. Wait for Terrain GameObject to be generated
6. In the Hierarchy window select TerrainGroup_0 > Terrain_0_0_d… (child object)
7. Observe the Terrain Tools in Scene view 

Actual results: Terrain Tools icons are low quality, blurry
Expected results: Terrain Tools icons are high quality, not blurry

Reproducible with versions: 5.2.1 (6000.0.49f1, 6000.1.2f1, 6000.2.0b1)

Tested on (OS): MacBook Pro 2021 (M1), Sequoia 15.3.2