Add your Brother machine with AirPrint (macOS)
Print both sides of paper or a booklet automatically
I cannot find some options in the Print dialog box. (For OS X v10.7 to 10.15)
Print on both sides of paper (Auto 2-sided/Duplex Printing for Mac OS X 10.5.x or later users).
Print both sides of paper manually (For Macintosh)
Print on labels and envelopes from the MP tray.