Add a cube widget to a column:

We can place a widget in the same column as another widget by dragging it from below (or above) and aiming for the center of the widget we desire it to be under, in the very same column and dropping it into place. The image below shows how you add a widget to a column.

Here is how to add a widget to a column:

Step 1: Click and drag a widget from the drag and drop menu (A to B).

Step 2: Drag above or below aiming for the center of the widget of the column you desire. (the highlighted area)

Step 3: Release the mouse to drop the image to the desired location.