Bug - "Terrain Tools Sample Asset Pack" not working properly in Unity 2020.3.1f1 LTS - Unity Forum
GitHub - Unity-Technologies/TerrainToolSamples: Unity has archived the TerrainToolSamples repository. For future development, please use the Terrain Tools package.
The latest Unity Terrain Sample Pack is here | Unity Blog
Unity] Create Your Own Scenery with the Terrain Tool | STYLY