Closing Preview documents without confirmation dialog AND without quitting Preview
Solution 1:
Try using ⌘-⌫ (Command-Delete). I read the list of system keyboard shortcuts for documents, and it is near the very end, and I just tried it, as I have had the same question for a few years now. Previously, I had not read far enough before giving up.
Solution 2:
Combining both of the other answers here really helps me (thanks!). With the preview window open:
- first press
Cmd-Wto close the current window. - Then press ⌘-⌫ (Command-Delete) to close the dialog
Now to commit this to muscle memory...