If you scroll beyond the Rivals of the Year section, you will see the typical TOTY Player claim and TOTY Exchange. Therefore, if you have selected H2H, you will be restricted to playing only H2H in Rivals of the Week for the entire week.
Please note that once you have made your choice between VSA or H2H, you cannot change it. An additional Exchange is now available to earn 5 more Rivals Tickets. To begin, claim your 15 weekly Rivals Tickets in the Tickets and Rewards Section, and then choose whether to play VSA or H2H for the week. Here, you can participate in weekly PvP Matches against other players and receive rewards based on the number of Matches won.