New player rewards switch from tactics to classic?

Haven't played in a long time. Decided to create a fresh account. When I logged in the client, it gave me two options the old style matches or team fight tactics. I guess I accidentally hit teamfight mechanics and it's making me do tactics based missions for my new player rewards. I haven't done anything, no matches or tactics. Is there a way to swap or do I have to make yet another account to switch to regular match rewards while leveling up?

Thanks in advance.