1. A method of editing event categories, the method comprising: at an electronic device: displaying a video monitoring user interface on the display with a plurality of user interface elements associated with one or more recognized event categories, wherein each event category corresponds to one or more motion events classified into the event category based on respective motion vectors of the motion events; detecting a user input selecting a respective user interface element from the plurality of user interface elements in the video monitoring user interface, the respective user interface element being associated with a respective event category of the one or more recognized event categories; in response to detecting the user input, displaying an editing user interface for the respective event category on the display with a plurality of animated representations in a first region of the editing user interface, wherein the plurality of animated representations correspond to a plurality of previously captured motion events assigned to the respective event category; detecting one or more subsequent user inputs selecting one or more animated representations in the first region of the editing user interface; and in response to detecting the one or more subsequent user inputs, indicating a set of previously captured motion events corresponding to the one or more selected animated representations for disassociation from the respective event category, such that subsequent classifications of motion events into the respective event category are not based on the respective motion vectors of the set of disassociated motion events.