You are able to make changes to the styling of your video. To make edits, select Style. You will then be able to edit the styling including:
Captions – Select which style you would like for the captions, choose from one color or highlighting the word as it’s spoken. You can also toggle to burn captions onto the video.
When your changes have been made, select Re-render video and Done.
See this article for information on how to edit your transcriptions or generate chapters.