Is it possible to reverse the breakpoints direction hierarchy to a “mobile-first” version where styles are progressively added to the larger breakpoints - the opposite of the red arrow in this screenshot?

you can edit the Mobile portrait Breakpoint with the pencil-icon and set it as the default Breakpoint. This will result in Bricks being Mobile first.
Sadly I can’t recommand doing this, because it has some unexpected sideeffects. Some Settings don’t work as expected in Mobile first e.g. the Carousel. In my Experience all CSS-related Controls work fine though.
And it’s tought to change back, so try it out but maybe not on a live-site.
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