What is the usage of the new Subject Management feature on Osmo Pocket 4?

On the Subject Management page, you can register and manage up to three subjects, which can be the same person if needed. Once registration is complete, you can enable the “Registered Subjects Only” gesture control option. When the “Registered Subject Priority” focus mode is on, Osmo Pocket 4 prioritizes focusing on the registered subject. When the “Spotlight Follow” tracking mode is on, Osmo Pocket 4 quickly tracks the registered subject.