Okay, so I really tried to understand why the exp.share in SwSh is permanently and play to take advantage of it. But no, it sucks and I want to disable it. It just results in you never using your full team. My I've got a couple my team of six is all level 23 to 25 and I'm wrapping up the second gym. I haven't used four of those Pokémon since level 17, which was before the first gym.
Why isn't the exp.share just an option? Bloody hell. This is most ridiculous decision as you don't get to appreciate and train type individual Pokémon anymore.