A recent update (approximately v21.1.7) resulted in excessively large margins when using the Print function on Macs. For example, the Plain theme prints like this:
The effect is equivalent to approximately 100 pixels of padding instead of the default 30.
A possibly related forum topic is:
This is exactly what I was talking about. I am using Manager v. 21.1.11.
Thank you, @Stein_Design_s, that was important information.
The latest version (21.1.20) should be fixing this issue.