In versions of macOS before macOS Mojave (10.14), one could press the Alt/Option key when viewing an image in Quick Look to zoom in to the "actual size" of the photo.
When the macOS Mojave beta came out, it seemed as though that feature was removed. I asked a question about it on here, and it turned out that the shortcut key was changed to Control.
In the last few beta versions of macOS Mojave as well as the public release, unfortunately, this does not seem to be working anymore. I tried all combinations of modifier keys that I could think up of, but nothing seems to work.
Is there any other new shortcut for zooming an image in Quick Look on macOS Mojave?
Best Answer
In the public release of macOS Mojave 10.14, Command + 0 keyboard sequence appears to achieve the desired function.
To zoom back out again use the keyboard shortcut Command + 9.
You can use Command+ and Command- to Zoom in and Zoom Out, like you can do at Preview app.