How to reproduce:
1. Open the project from comments or create a project and set up "Terrain Tools"
2. Enter Scene "SampleScene"
3. Create and/or select a Terrain GameObject
4. Move the Terrain and Brush menus in Scene View
5. Close and Open the Project
6. Observe Scene View
Actual result: Brush and Terrain menus do not save their position and default to the left top corner of Scene View, although they can be seen with saved positions for a split second when the Editor loads up again
Expected result: Brush and Terrain menus save their position in Scene View and load when the Project opens
Reproducible with: 2023.1.0b3, 2023.2.0a2