The Preview mode shows how the final edited video will look like. It also offers tools for moving, rotating, and scaling images, as well as scopes for analyzing color distribution.

Preview mode

Preview mode of the Video Sequencer.

You can pan around the view with MMB and zoom with Wheel or NumpadPlus/ NumpadMinus. Alternatively, you can use the gizmos.

Pressing Home resets the view, maximizing the size of the preview within the editor’s area.