
This capability is best used with thumbnails in the sidebar of Preview, so if for some reason you are hiding those be sure to enable the thumbnail viewer as part of the Preview app by clicking the sidebar option in the Preview tool bar. Opening all files and images in Preview into a single window will look like this:Ĭompared to this, where some files will open in separate windows within Preview, but some will be grouped as well, depending on when and how they were opened in the app:


Open All Images Into a Single Preview Window on Mac OS This is a simple usability adjustment that can make the Preview image viewer on the Mac a bit less cluttered.
