Abstract: An electronic device with a display, processor(s), and memory displays a video monitoring user interface including a camera feed from a camera located remotely from the client device in a first region of the video monitoring user interface and an event timeline in a second region of the video monitoring user interface, the event timeline including event indicators for motion events previously detected by the camera. The electronic device associates a newly created category with a set of similar motion events from among the previously detected motion events. In response to associating the category with the set of similar motion events, the electronic device changes at least one display characteristic for a first set of pre-existing event indicators from among the event indicators on the event timeline that correspond to the category, where the first set of pre-existing event indicators correspond to the set of similar motion events.