How to print out your calendar?
Simply click File, then Print in your browser. Select scale options: Fit to page width option should show one month per page, or select Scale option and set to 66% or below to get 2 months per page.
You can use the following line in Custom CSS to get 2 months side by side (and then scale 42% to print 6 months on a page):
.calendar-grid { grid-template-columns: 2fr 2fr; }
This is how it looks in Firefox browser (click to see bigger image in a new tab):