Problem: This view with higher breakpoint is not working.
No matter what breakpoint I choose as the view, when loading a new page to edit, the original view is always the Base: Lowest breakpoint for mobile.
We haven’t been using this for our client sites yet as we are waiting for this feature:
However, I tested on one of our test sites and it worked perfectly for me.
One final check - do you have Force Iframe enabled or disabled? (we have it enabled for all of our post types for a more consistent editing experience)