The main area of the interface is taken by the grid. Its cells display a video from the cameras in real time:
The camera could be selected by the cursor, and then dragged to another cell.
You can resize the columns and the rows of the grid, thus making some cells larger and some smaller.
You can also change the number of cells in the grid. To do this, click the desired number of times on the button "Camera Layout" on the toolbar, or select the desired number from the popup menu of this button.:
In order to maximize the preview of the camera (set Full Screen Mode), click at the button: