HUGELY seconded. I was literally - literally - reaching for my wallet to pay for a Newton subscription, then saw that you CAN’T keep the sidebar open, not even as an option, and far worse, there’s no option for a preview panel. I get that “distraction free” in that sense works for some people, but lacking those two features was an absolute dealbreaker for me. Which is heartbreaking, because I can’t find another alternative - everything else either isn’t cross platform, doesn’t have open tracking, or has some other dealbreaker. Why the hell can’t anybody seem to make a truly good email client?? I’d gladly pay for it.