How do you delete from Preview?
I have tried View>Contact Sheet and the only thing that shows is whatever I was working on, no others. I click on that and then the Delete key or from the menu and nothing happens.
MacBook Air, macOS 14.4
Are you trying to delete a page from a PDF? Is the document locked? Select the document in Finder and click command-i, or go to the File menu and choose Get Info. Near the top of the window that opens there should be a checkbox for Locked. If someone else locked it, you can't undo that without a password. If it's not locked, scroll down to the bottom (you may want to close the Preview section: click on the little > symbol) and look for Permissions, to see if you have write access (Read & Write) or Read Only. Normally, if it's your computer, you should have read and write privilege, unless the file was locked when you received it. If you are on a company computer, i.e., you are not the administrator, you'll probably have to check with IT or whoever created the document.