They should be one style. If they need to look different use a nested style for them.
Hmm, in the TOC there is no need for them to look different but in the book they DO need to look different how do I proceed?
I did an EPUB like this not that long ago. The chapter titles used a nested style with a forced line break.
I created a new TOC style for it and manually removed them.
There’s very little work involved even if it’s a very long TOC since you can use find/change.
got it thx!