Being in the driver's seat is a commonly used idiom to describe being in control or in charge of a situation. However, there are several synonyms that can also portray this sense of authority and responsibility. It can be expressed as being at the helm, holding the reins, calling the shots, being the boss, being in command, having the upper hand, being in charge, leading the way, steering the ship, or wearing the pants. All these phrases imply that the person has the power to direct, manage, and make decisions, and hence, convey the confidence and empowerment that comes with being in control.