Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Create a new UXML document and open it in UI Builder
3. Select the .uxml file in the Hierarchy
4. In the Inspector or in the Viewport, change the Canvas Size Width/Height
5. Click on the three dots in UI Builder and select "Reset UI Builder Layout"
6. Observe that resetting does not affect Canvas Size
7. In UI Builder Inspector, enable "Match Game View"
8. Repeat the 5th step to reset the layout
9. Observe the Canvas Size

Actual results: Resetting the UI Builder layout sometimes resets the Canvas Width/Height to a previous value (in this case, after the 9th step - to a random value) and sometimes does not reset the Canvas Size at all

Expected results: Resetting the UI Builder layout has consistent behavior with Canvas Size (either always resets Canvas Size to a specific value or never changes it)

Reproducible with versions: 6000.0.66f1, 6000.3.6f1, 6000.4.0b7, 6000.5.0a5

Tested on (OS): Windows 11