On changing Canvas Width and Height using mouse dragger in the Inspector, size of Canvas not getting adjust runtime, Refer attached video.

Steps to repro:
1. Create a new project
2. Window > UI Toolkit > UI Builder
3. Select Canvas in the Viewport
4. Change Width and Height using mouse dragger

Actual Result:
Canvas size not getting change runtime in the Viewport when its Width and Height is changed using mouse dragger

Expected Result:
Canvas size should be change runtime gracefully

Note:
1. UI Toolkit package introduced in the Unity 2020.1.0b12
2. UI toolkit is the core package from 2021.1.0a5
3. When width and height change by mouse dragger, changes are reflected to canvas on releasing the mouse dragger button

Reproducible in:
2021.1.0a5, 2020.2.0b11, 2020.1.12f1, 2020.1.0b12with package version 1.0.0-preview.9, 1.0.0-preview.1, 0.11.2-preview

Environment:
Occurring on Windows 10 & macOS 10.15.