Page 63 - Photoshop for Lightroom Users – Scott Kelby 2nd Edition

Not Sending it Back to Lightroom:
If, after you send an image over to Photoshop, you decide you don’t want to edit it after all, just click on the window’s Close button (or press Command-
W [PC: Ctrl-W]), and then when it asks if you want to save the document, choose Don’t Save. Easy peasy.

Preferences: Choosing How Your Files are Sent to Photoshop
When you move an image from Lightroom to any other program, it’s called “external editing” since you’re now editing the image outside of Lightroom.
There’s a set of External Editing preferences, so you can choose which programs to use for your external editing and exactly how (and in what format)
those images are going to go over to that other program. Here’s how to set things up your way from the start:

Step One:
Press Command-, (comma; PC: Ctrl-,) to bring up Lightroom’s preferences, and then click on the External Editing tab up top (seen here). If you have
Photoshop installed on your computer (and I’m assuming if you bought this book you do), it automatically becomes the default choice as your External
Editor, so you don’t have to do anything to make that happen—it’s good to go (if you have more than one version, it uses the latest version as the default,
which in my case would be Photoshop CC 2019; it’s circled here in red). If, instead, you have Photoshop Elements installed, then that becomes the default
External Editor.