This page of the Assassin's Creed Valhalla has a description of an important choice in the Rygjafylke region that you will have to make in The Seas of Fate quest.
The selection takes place in the final stage of the Sea of Destination mission. Before the expedition to England, Sigurd asks Eivor what to do with the supplies. Taking the supplies to England will not be favorable to Sigurd, especially since they previously belonged to Kjotve. If you decide to leave the supplies to Styrbjorn in Fornburg, you will get Sigurd's approval, which will influence his final assessment of Eivor as a leader.