Subtitle Font Size
From SAP Enable Now Wiki
Where to find it
- Playback Settings > book reader > Visual Properties category > Subtitle Font Size
Purpose
If the Show Subtitles setting is selected, then any Text-to-Speech text specified in Book Pages will appear at the bottom of the Book Page as a subtitle.
This setting can be used to specify the font size (pixels) of the subtitle text. The height of the subtitle 'box' will automatically be resized to accommodate the text.