in the preview window, you can use your left or right mouse button to resize, position, and rotate your clip

   

    1 you must first select the type of transform settings you want to adjust by clicking the appropriate button (position, size, offset, or rotation).

    2 alternately, you can use keyboard shortcuts to select the transform setting you want. press q for position, w for size, e for offset, or r for rotation. you'll notice that the values will change for the selected controls as you drag the mouse in the preview window.

    the following table shows the available mouse controls for working in the preview window.

   

    for example, if you want to alter the position of your clip on the y axis only, first click the position button, then press and hold shift while dragging the mouse up or down in the preview window.