The Mask Area feature allows you to block motion detection in a particular area. You can select an area to mask in the preview window. This reduces the possibility of unwanted triggering of alerts. For example, you want to monitor your garden but do not want the motion on the road outside it to be taken into account, then you can mask the portion of the preview that shows the road. Each camera can be masked individually.

Select the camera from the Thumbnail view or Preview window, click on Camera > Mask or the Mask Area icon on the Camera Controls.

In the dialog that is displayed you can select and mask an area in the preview window. Check the Enable Masking option.

A rectangular box with columns and rows appears in the Preview window. Drag the mouse cursor to cover the part of the area that you want to mask in the camera. If you want to change the mask area, then click on Clear Mask. The same procedure can be followed to unmask an area that was masked earlier. The Event Log shows an entry informing you that motion will not be detected in the masked area.