Subtitle Menus can be configured to display either character or narration text only.
Duplicate your existing Subtitle Menu, and set the For speakers of type field to Narration Only. It will then only show narration text, so you can modify it to suit.
Be sure to set your original Subtitles Menu to then show Characters Only, so that it no longer shows narration text.
Comments
Duplicate your existing Subtitle Menu, and set the For speakers of type field to Narration Only. It will then only show narration text, so you can modify it to suit.
Be sure to set your original Subtitles Menu to then show Characters Only, so that it no longer shows narration text.