If an app is completely frozen and won't refresh, use Command + Option + Esc to bring up the Force Quit menu and restart it. Mac keyboard shortcuts - Apple Support (IN)
🍎 If you miss the Windows F5 habit, you can remap a keyboard shortcut in System Settings → Keyboard → Keyboard Shortcuts → App Shortcuts to add “Reload” to Finder with F5. refresh button on mac
If you are looking at a folder and the files seem outdated or missing: If an app is completely frozen and won't