If it is, close it straight from the Activity Monitor.
You can check the Activity Monitor ( Command + Space, type “activity monitor”) to see whether one of those apps is running in the background. For example, you can use F1 for help, F7 for spelling, and shift + F3 to insert a function. As you know, function keys are uses for many shortcuts in Excel.
Standard Mac keyboard with 12 function keys. Check to see whether camera-based apps like Skype, FaceTime, Photo Booth, or another app is running either in the foreground or background and close any that you’re not using at that moment. These keys sit at the top of the keyboard and are labeled F1 to F12 on standard keyboards and F13, F14 and higher on extended keyboards. One thing that’s quite easy to forget is that the camera can usually only be used by one app or program on your Mac at any given time. Related: How to Fix Webcam or Camera Not Working in Windows 10 Is Another App Using the Camera? If you’re having trouble with the Mac camera not working and using the built-in camera, try one of these quick fixes to get it working again. Camera issues on the Mac are usually minor, and their solutions can be as simple as just shutting down and powering up your computer. Don’t panic if your Mac’s camera suddenly stops working during a video call or if you see a “No camera connected” or “No camera available” error when you launch an app.
