Hi Colleen,
The option for the paper sizes in Photo Gallery depends on what printer is used. To check the settings for your printer, please follow these steps:
- Select the Photo to print.
- Press Alt+F, select Print, then click the Print option.
- Select your printer, the click Options on the lower right.
- Click Printer properties.
- The option for your printer should show up. Locate the option to select the paper size and paper that you will be using. Click Ok afterwards.
- The Paper size should show up the selected paper size on the printer properties. Click Print to print the photos.
Please let us know if you need more help.
Thanks!