Welcome to HP Support Forums. 
Thanks for reaching out to us on HP Support Forums. I came across your post and would like to assist.
I understand that you have an HP Photosmart C4200 All-in-One Printer. I read that the option to change the size of the photo does not exist anymore.
To provide an accurate resolution, I need a few more details:
- What print application are you trying to print from?
- Have you tried to print using a different application to print the photos?
Meanwhile, I did some research and came across this HP article. The article explains about printing photos in Windows 10.
I hope this information helps. Keep me posted. Cheers!