Control of hearings

Watching the Paul/Fauci entertainment leads me to wonder - why is it that Paul (or whoever) is permitted to repeatedly talk over the witness and not give him a chance to answer. What are the rules? Can’t the Chair turn off the offenders mic? Maybe after a warning? Paul did what so many Republicans do - shout, interrupt and otherwise prevent the other guy from talking. Its a farce. Yet, whoever in supposed to be in control just lets it go on. I wish it were more like court. Ask the question without “speechifying” and shut the hell up while the person answers.