Paper size not switching from 5x7 to 4x6

[Gardener1951]

My hp 7855 printer will no longer switch paper size in its window or in the Apple app.  I’ve tried changing the photo paper, removed  the 8.5x11 paper from the lower tray, turned off the printer, unplugged the printer and  It is stuck at 5x7 size and will not change to 4x6 for printing photos. 

[sandytechy20]

@Gardener1951

Welcome to the HP support community.

Remove and add the printer using Airprint

Click the Apple menu, and then select System Preferences.

Depending on your operating system version, click Print & Fax, Print & Scan, or Printers & Scanners.

Click the name of your printer, click the Minus sign, and then delete the printer.

Click the Plus sign, and then click Add Printer or Scanner.

Click the Use or Print Using box, and then select AirPrint

Click Add to add the printer to the list.

Try to print.

Let me know how it goes.

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.

Cheers.