Print at the right paper size
Choose the right paper size and scale so the printed invoice does not lose its totals.
In the browser print dialog, choose A4.
Set the scale to 100%. "Fit to page" can shrink the text and shift the layout.
Turn on the print preview if there is one, to check the totals still sit inside the page.
If the invoice is cut off, check the scale and the page margins before printing for real.