Keys 1 to 6 switch scenes while recording (Shift+1 to 6 when more than one camera is connected). Scenes with a second picture need a webcam or screen share (Settings → Second picture). Drag the boxes on the picture to move them.
While this tab is open, draw on the picture with a finger or the mouse. Drawings are recorded.
Move your toys a tiny bit, take a frame, and repeat. A tripod keeps the camera still.
Masks follow your face. The first time, face tracking downloads about 2 MB, so it needs the internet. Pictures stay on this computer.
Captions are also saved as a .vtt subtitle file next to each video. Chrome sends what it hears to Google to turn speech into text, and it listens through the computer's default microphone.
Product photos are saved clean, without effects, at the camera's full size, in the Products category with matching numbered names.
If lips move before you hear the words, raise the sync delay. Capture cards often show the picture 100 to 200 ms late. Use headphones when listening, or speakers will echo.