I'm using Sequoia and Photos 10.0 and AirPrint (since my printer's manufacturer did not see fit to provide drivers for current versions of macOS). There are no obvious options for printing multiple photos on one page.
I'm guessing that the LAYOUT option to which the Google search results refer is something that was in old versions of Photos / iPhoto, or that depends upon having a manufacturer-supplied driver for the printer.
In Photos Help, I found this:
"Tip: To print multiple copies of the same photo on a single page, create as many duplicates of your photo as you need, then select them all before choosing File > Print."
You may want to check and see if your version of Photos supports this, too.
Even with that, there still doesn't seem to be a lot of control over where Photos places the photos on the page.