Use capture mode when you want to code a live video feed in your capture movie window.
Set up your capture and open your code window.
If you'd like to code your timeline based on the timeline movie window, use code mode.
Activate a code button.
Deactivate your code button when appropriate. The instance created will be at the end of your timeline.
Capture mode will always add instances to the end of a timeline because it's based on the live video feed.
The green zone on the timeline will update as the video enters Hudl Sportscode.