You can print the documents you create using Pixelmator Pro directly from the app.
The following instructions assume that your printer is already set up. You can set up a printer in Printers & Scanners preferences on your Mac. Click the Apple menu in the top-left corner of your screen, choose System Preferences, then click Printers & Scanners.
Do one of the following:
Specify the number of copies you want to print.
If you don’t see Pixelmator Pro print options, click Show Details at the bottom of the print dialog.
Select the paper size, the number of copies you'd like to print, select the checkbox next to Black & White if you'd like to print in black & white ink only.
Tip: If you're looking to print an image at its actual size, make sure the document is scaled to 100% in the Print settings.