Rogue doesn’t get the extra attack, and only has 1 bonus action, so at most it would be 2 attacks, no? Thieves don’t have any kind of extra attack of bonus action or nothing: https://roll20.net/compendium/dnd5e/Thief#content
Main attack is Action+Bonus action, and then I have a bonus action left over. I spend it on a bonus offhand attack. One, two, and then 3 hits a turn.
You are talking about Baldur’s Gate 3, right? This is the tabletop rpg instance, it would be cool if you at least mentioned that. They did some changes to the classes, the thief gets two bonus actions in BG3 but not in tabletop dnd5e, for example. Also, you would need the crossbow expert feat as the other poster mentioned to even use your bonus action to shoot with the offhand.
