There is a setting (found on the crusade in-game screen, *not* in game settings) that performs battles automatically. And importantly, the game tells you the result of the auto-battle and then you can choose whether to accept that result or fight the battle manually.
This has been a huge help in limiting the number of easy-but-tedious battles I have to sit through.
It was on by default in beta and it was all sorts of messy, for the record. Like, giving you a flawless victory on some super-tough unwinnable battle or a crushing defeat on something that was a complete pushover if done manually.
Party control in Baldur's Gate 3 is a complete mess that begs to be addressed. SAY NO TO THE TOILET CHAIN