Hi Angeline
What printer are you using?
Have you checked for a print driver update?
What Mac hardware are you using?
Have you tried resetting Photoshop Preferences?
Have you tried reinstalling the printer driver?
Is this relevant?
Landscape Printing Bug in High Sierra |Official Apple Support Communities
I'm not a Mac user, but this will at least bump your post to the top of page one. I have also edited the subject line to make it clearer what the issue is.
Good luck.