Change movie window size and location
You can change the size and location of the Viewer window.
Resize the Viewer window: Drag the lower-right corner for a custom size, or choose a size from the View menu.
View full screen: Choose View > Enter Full Screen, or click the double arrows in the upper-right corner of the DVD Player window. If you have multiple displays, drag the Viewer window to the display you want to use before clicking the double arrows.
Minimize the Viewer window: Choose Window > Minimize, or press Command-M.
Keep the Viewer window in front of other windows: Choose View > Viewer Above Other Apps.