had a discussion with @Bon about visibility. I realized that stopped working in elements in the new release. Actually its not the visibility. It looks like there is a intermediate step between XL and LG.
I might have an error on the containers. But not sure how to fix that.
I see the same effect in the browser. First I thought XL not equal XL if Elements does not have enough space.
Ok I figured out the problem. I had on the lg level a wrong setting for the flex box. The problem was not the divider
BUT …
What I realized is based on the screenshot above I should be on “XL” size and because with all the side bars open and I do not have the space for XL I see a “lg” preview.
I’m not sure if I understood your question. But there is a display at the bottom right of the editor that indicates what breakpoint you are on and whether it is being scaled or not.