Make sure macOS is up-to-date.
Preview might not work on your Mac because the version of macOS you’re using has a bug that was fixed in a later version. Select About This Mac from the Apple menu. Choose to update the software. If there is an update, click the Update now button.
How do I get Preview back on my Mac?
To open a Finder window on your Mac, click the Finder icon in the Dock. Choose the folder or file. If the Preview pane on the right isn’t visible, go to View > Show Preview.
Why are my thumbnails not showing the pictures Mac?
This function can be enabled and disabled in Finder -> View -> Show View Options by checking the box next to Show Preview Icon, but it may not work in some cases even if the setting is enabled.
Why is my Preview app not working?
How you might try to help: Get the latest version of Preview and install it (go in your app store app and check if there is an update available) Don’t uninstall Preview; just turn off and on your phone.
How do I update Preview on my Mac?
On your Mac, open the App Store.
In the toolbar, click “Updates.”
You can update each app separately, or you can click “Update All” to install all updates at once. Use “Search” in the upper-right corner of the window to find software upgrades instead of updates.
How do I turn on the Preview pane in Mac Mail?
If you don’t see that column, make sure to first choose View > Show Side Preview from the Mail menu. It should have a check mark next to it, like this: If that selection is as shown and you still don’t see the Side Preview column, do the following. When that happens, move your cursor to the left.
How do I change a JPEG icon to show the picture instead of the icon on Mac?
Choose the file or folder whose icon you want to use on your Mac.
From the menu bar, choose File > Get Info.
Click the small icon at the top of the Info window.
Use the menu bar to choose Edit > Copy.
Choose the file or folder you want to change the icon for.
How does Preview work on Mac?
Open a PDF or image you want to look at on your Mac using the Preview app.
Any of these things: Show small pictures: Select View > Thumbnails or View > Contact Sheet. If a document has a table of contents, it will be displayed: Select View > Table of Contents.