Ok, no worries. I have seen some people using Zoom breakout rooms to divide the class, I do not know if that would be helpful for labs or not.
I believe lab sessions would be easier for both the TAs and students if we change the way we communicate. For example, if we have a question for the TA, we can start with "@TA", and if we just want to ask the class, we can use "@class" in our messages. Also, zoom offers a private message feature that allows two people to have a discussion without affecting the flow of communication in the main chat room.