Steps To reproduce:

1. Create a new project
2. Window > Package Manager > Import 2D Sprite Shape
3. Project > Create > Sprite Shape Profile > Empty.
4. Drag the Sprite Shape profile from the project window to scene view. (10,10,0)
5. In the Inspector, click on Edit Spline

Observed Result : The focus on sprite shape profile is lost.

Expected Result: The focus should remain on sprite shape profile.

Reproducible On: 2018.3.0a9, 2018.3.0a4

Not Reproducible On: 2018.3.0a3

Environment: Occurs On windows and Mac