The Fullscreen tool presents the Preview as full screen on the computer. This allows to do soft subtitling, eg. subtitling a film with a video projector. The fullscreen window is black and the subtitle at the top, so that the videoprojector does overlap the filmprojector only partially. The fullscreen shows the subtitles only as they are rendered in the Preview, eg. white on black.
The subtitle file must have timecode comments. The fullscreen window works as a player with keyboard control. On the bottom, you can see some status messages: On the left, the current timecode and the speed, on the right the text and timecode of the next title to be displayed.
The following keys control the fullscreen
The starting timecode position is the position of the movie, if a movie is available. If there is no movie, it is the selected title in the titlelist.