Hi there, @gkwbernieloerzel!
Let me help you sort out your set up in printing your invoice.
You'll have to toggle your printing option to landscape or portrait orientation before you print your invoices.
You can also check your PDF reader tool if it has no issues by updating or reinstalling the software.
Feel free to read this couple of articles for more details:
You can always get back to us by leaving a comment below if you have any other concerns. Have a great day!