

This forces any apps that macOS says are not open to restart, bypassing the error message. If it’s not possible to close Preview using Force Quit or Activity Monitor, you can close it by rebooting your Mac instead.

But it has frozen and needs to be reopened. Despite the error message telling you Preview “is not open anymore,” it usually is. The first thing to try and do - although it doesn’t always work for this error - is to close the unresponsive app. Can’t delete a file on macOS because it’s ‘In Use’? Try this!.How to quickly restart or relaunch Finder in macOS.

How to fix corrupt user accounts in macOS.Update and then reinstall macOS using Recovery Mode.Remove your Preview preferences from the Library.Reboot your Mac, using a hard reboot if necessary.Force Quit Preview using command+option+escape.Here are the basic steps to fix Preview when macOS tells you it’s not open anymore, we’ve explained each step more fully in the article below: How do I update to the latest release of macOS?.How do I remove my Preview preferences?.How do I close Preview using Activity Monitor?.How do I close Preview using the Force Quit window?.
