On December 13, 2018 at 11:02, goldenzrule said...
No, in Mohave it will automatically go to split screen when trying to send an email (and other functions as well). You can go into mail preferences and uncheck a box for split screen but it has no effect. It will NOT open the send mail window in full screen without pressing the green expand button, twice.
I have Mohave and nothing of the sort happens to me. Did you download your OS from The Internet Research Firm in Russia?