For display and 'Save Stereo' the movie may be surrounded by a frame of a chosen color and thickness

A color may be chosen from one of 48 predefined colors or 16 custom-defined colors.

When side-by-side movies are displayed, you may choose the spacing as 'Narrow', 'Medium' or 'Wide'and toggle between them with the 'E' key.
The option here allows you to set your preferred default, spacing-mode.

The sound of a movie may be muted when in Play(Both) mode.