Screen lines - the number of vertical rows (lines), which also sets virtual bottom position for formats such as PAC or EBU STL. For example, if Screen lines = 11, a top aligned row will have index 1, a bottom aligned row will have index 11.
Subtitle lines - expected number of lines in each subtitle
Line length - maximum number of characters allowed in each line
Auto-break line - if checked, the app will automatically break a line when the number of characters exceeds maximum Line length (see above) in two cases:
- as you type
- on file import
Screen margins - sets the subtitles preview area (top, bottom, left, right) for the in-app player and image exports