Why is my entire page not printing content?
That’s usually because the printer driver itself has default borders set for each document, and until they’re changed your document will print with a border or your program will tell you that you’re trying to print a document that’s too large for the page.
How do I get my printer to fill the whole page?
Press Windows key + R, to open Run dialog box. Type control printers and click on OK. Now, right click on the Printer and select Printing preferences. Click on Advanced and check the option Borderless Printing.