When you start Filmora scrn for Mac your recent projects are listed, as well as a quick menu leading to two different working modes: Quick Capture and Video Editor.
There are two different ways to record your screen: through the Setup window and using Quick Capture
Click on the gear icon and the Setup window will pop up.
Here, you can adjust your default screen recording settings:
And your audio recording settings:
And the settings for recording from a webcam:
Click on the "Quick Capture" button and a quick recording window will pop up:
You can adjust your settings here before recording.
Head over to Video Editor to access the video editing interface.