Questions about the gameplay of Heroes 6.

Hello! I started playing Might and Magic Heroes VI. I completed the second mission and captured a castle. A window appeared saying that you won and offering the choice to start over or end the game. There is no "continue" button like after the first mission. As a result, the second mission is not marked as completed on the global mission map. Please advise what to do and how to fix this.

Added after 1 hour 1 minute
I understand that there are only 2 missions. That's disappointing. The previous installments were better. Question closed.