During an unattended remote control session, if you find that the client machine's caps lock key is on, you can turn it off using built-in tools.
- Open System Preferences
- Open Keyboard
- Enable "Show keyboard and emoji viewers in menu bar". That will add a menu bar item that we need to use.
- From the keyboard menubar choose "Show Keyboard Viewer"
- From the onscreen keyboard, you can control caps lock.