I’ve setup motion recording but the device performs 24h recording.

Please check which of R/S/E is displayed at the bottom the channel on the live screen.
If R is displayed, it means that the recorder is currently recording. If you click Stop Recording from the mouse right-click menu, the full-time recording stops.
If S is displayed, check whether reserved recording is set continuously at Main Menu > Recording > Record Reservation Schedule.
If it is set to Continuous, please change it to event.