Quick! First answer that pops into your head: When you press a Print button, what do you think will happen next?
It will print, right? Sure, but not when you’re using Photos for macOS. Printing in that app is a two-step operation missing a familiar cue in the first step about the sequence that follows.
When you select an image or images and select File > Print, the Photos print dialog appears with just a few options. You can select the printer, the paper format, and a prefab printing setup. For some layout choices, like Contact Sheet and Custom, additional options appear at the bottom.