One thing that has annoyed me for a long time is how you can’t keep modals, off-canvas areas and dropdowns open while working on them in the builder. Depending on the settings, accidental clicks outside the toggleable content area closes it, as does clicking on the close button in case of modals and off-canvas elements. So if you want to style the close button you can’t really use the preview area to get to that element’s settings.
Could there perhaps be an option to force these elements open while you work on them?