During a Screens session, you may select one of these modes by tapping the Actions button in the Scrollable Shortcuts Toolbar.
Observe Mode lets you see what is happening on the remote computer, but disables the Shortcuts Toolbar and keyboard, and will not send mouse/trackpad commands. You can configure Screens to use this mode automatically in the saved "screen" settings.
Note: When Observe Mode is selected, Screens remains active and turns off your device’s display timer. This allows the app and the device’s display to remain active without user interaction.
Control Mode is the default mode. Keyboard and mouse/trackpad commands are sent to the remote computer, along with any shortcuts from the Shortcuts Toolbar.