


Note: This tip works for macOS High Sierra and Mojave. Performing a switcheroo every time gets old pretty quickly, so I decided the best thing to do would be to merge the two libraries into one on my Mac. (Holding down the option key while launching Photos allows you to pick which library to use.) If you’ve done this, too, then you know you must hold down the option key when you launch Photos to choose which Photos Library you want to use, unless you’re lucky enough to have the target library open right off the bat (and that never happens).

When Photos came along, I set it up to work with either library. In the past, I’ve used Aperture to store my business-related images, and iPhoto to keep my personal pictures organized. If you’ve been working with the Mac’s Photos app (or even the older iPhoto or Aperture apps) for any length of time, there’s a good chance you have multiple image libraries to help you organize your pictures.
