Screen Recording in macOS Catalina
Along with enabling Accessibility, which was introduced with macOS Mojave, a new permission has been added with macOS Catalina. Screen Recording must be enabled to allow Luna Display to access the contents of your screen.
Luna Display does not record the contents of your screen. We do not save any of the data used when this feature is enabled.
Click "Enable" on the Enable Screen Recording step of the Luna setup.
The system should automatically prompt with a pop-up window stating that "Luna Display would like to record this computer's screen".
The system will only prompt you once. Click the "Open System Preferences" button.
Select the checkbox next to Luna Display.
Luna Display should connect without needing a restart, however if your screen does not display after your devices are connected, try restarting the app.