When Blackboard is toggled off from the New Shader Graph window, Texture properties and Scroll bar don't disappear with the Blackboard window, refer to the attached video.

Steps to repro:
1. Create a new project
2. Windows > Package Manager > Shader Graph(7.1.7) > Install
3. Project > Create > Shader > PBR Graph > Open
4. Add a few properties on the Blackboard list.
5. Click on the Blackboard button.

Actual Result:
Texture properties text and Scroll bar doesn't hide on disabling Backboard

Expected Result:
On disabling Backboard, the whole backboard window disappears.

Reproducible in:
2020.1.0a19, 2019.3.0f6(69ba09c9b97e)

Working Fine in:
2020.1.0a18, 2019.3.0f5

Package found version: 7.1.7

Environment:
Windows 10 & macOS 10.14