To delete continuous recording files
Call View - Browse Files, it will open the directory location with all the recordings. Delete the files starting with rec_ which you do not want anymore.
To delete detection files
Call View - Browse Files, it will open the directory location with all the detections. Delete the files starting with det_ which you do not want anymore (for each detection event there are usually two files: a small video in .gif format and a corresponding full video in .mp4 or .avi format).
Note: each time that video files are deleted the web page is updated as soon as the browser's reload button is pressed.