Story conversations will be broken into segments based on content. When skipping, you'll see a summary of the major characters and key events that appeared in the skipped segment. The Dialogue Skip feature will apply to dialogues in Trailblaze Mission, Trailblaze Continuance, Companion Mission, and Adventure Mission. It does not apply to cutscenes or exploration gameplay.
You may use the Dialogue Skip function by clicking the icon on the top right.