If your Mac stops showing thumbnails properly, use Activity Monitor to force quit “com.apple.quicklook.ThumbnailsAgent” process, then relaunch Finder. #macOS Tips forums.macrumors.com/threads/thumbn…

If your Mac stops showing thumbnails properly, use Activity Monitor to force quit “com.apple.quicklook.ThumbnailsAgent” process, then relaunch Finder. #macOS Tips forums.macrumors.com/threads/thumbn…