Hey there,
This is something that has been annoying me for a while, and I’m sure 100% of Pro/X users would benefit from this:
Mobile XS view should shrink to 320px, not 480px. Same for other viewport sizes.
Showing the SMALLEST screen size of each media query would make it impossible to have surprises when viewing the site on phones and tablets. I often have to take guesses in the page/header/footer builder and then go in Chrome’s Inspector tool to make sure nothing overlaps on a 320px phone.
Thank you for taking this suggestion into consideration.
Pro is by far the best Wordpress theme out there and I’ve already been recommending it to all my friends. This small adjustment would make it even better 
Thanks Team
Emile
p.s. I know there is already another thread about this (by @klepow / view here). I just really want this to happen.