https://www.makeuseof.com/combine-photos-into-collage-macos/
6 Quick Ways to Combine Photos Into a Collage on macOS
Use any of these easy methods to combine multiple photos into a single collage on your Mac.
www.makeuseof.com
Select all the photos to combine > right click > open with preview.app >
select one photo > select all and copy(A) > tool > adjust size > unlink lock icon (scale proportionally) > enlarge with or height > drag all(select all) and delete > paste(A) >
select the picture from the sidebar and select the whole canvas and copy > go back to the first enlarged canvas and paste
