

If I then double-click on any of those files, Preview will open with them all shown together in the same window, like so: To do that, I held down Command and clicked on those items on my Desktop. So with “Open groups of files in the same window” on, I have to be sure to select all of the image files I’d like to convert at once, like so: Clear as mud? Here’s what I mean by that. If you’ve got “Open groups of files in the same window” chosen as I do above, double-clicking on images will open them together only if they’re all selected at once if instead you pick “Open all files in one window,” then you can go through merrily double-clicking on any picture files you want, and they’ll all appear to be within the same working file in Preview. When the Preferences window opens, click on the “Images” tab and make sure the radio button next to “When opening files” is set to one of the first two options (i.e., it can’t be on “Open each file in its own window”).
