To be able to lock in the various screen sizes when working on a project. It seems like when I make a change or go out and come back in the screen size defaults and things don't always line up. It would be nice to be able to click a button to lock the screen size when working on a project.

Admin Note:

It's unlikely that we'd build this functionality as it would conflict with the way CSS functions to cascade from larger break points to smaller breakpoints.