What program are you printing from? When the printer dialog box opens, what scale do you have it at? Does it print small for all document types (e.g. html, word document, pdf, etc.), or on only certain documents?
For example, if printing from Chrome, click on the "+More Settings" and see what the Scale is set at. If not set at 100, change it to be so. If printing from Adobe, set the "Page Sizing & Handling" to "Fit" - stay away from "Custom Scale". If MS Word, in the "Zoom" section, set "Scale to paper size" to "No Scaling".
Each program that you try to print from, typically has an option to adjust the scale of printing. Make sure it is set to 100%, or fit to page, or no scaling. If your scaling is correct, then you need to check your Printing Preferences.
To do this in Windows 10, go to your Printers & Scanners menu in Settings. You can click on search and just type "printers" and it should bring up the option. Click on your printer and select "Manage". Then, click on the "Printing preferences" link, this will open up the Printer Preferences dialog box. Click on the "Effects" tab, and make sure the "Actual size" option is selected. Also, go to the "Paper/Quality" and make sure Paper size is set to the proper paper size (Letter 8.5x11 inches is most likely what you want). Then, click OK/Apply.
If this doesn't work, then you may need to reinstall or upgrade the driver from your printer. You can download it from here: https://support.hp.com/us-en/drivers/selfservice/hp-photosmart-5520-e-all-in-one-printer-series/5157533/model/5157535