motion detection: delete squares without delete all possible?

rotation

Young grasshopper
Mar 26, 2018
84
9
Using the motion detection in normal mode (not expert) one can draw squares by dragging the mouse.

Is there a way to delete certain squares without using the delete all button?
 
That does not work for me.

The only way I can get rid of a square is to delete them all.
I have set up a detection grid, click on define area (or whatever the english translation is - my cam is german), click on a square already set - it does not disappear, nor with dragging.

cam is a 2cd2142fwd, firmware is 5.5.0.
 
I tried, does not work.
The only thing is double click to layer the whole picture with motion detection.
 
Well, my Cam is connected to a Synology NVR1218. Do you mean I should set it on the Synology?

I do not do that. I do the motion detection setting on the camera and Synology Surveillance station is solely used for recording.