The opposite of un-seating is seating, which refers to the act of placing someone in a position of authority or giving them a seat, usually in an official or formal context. This can also refer to seating arrangements, such as arranging chairs or tables for an event or function. Other possible antonyms for un-seating include appointing, instating, or installing someone in a position of power or responsibility. It is important to note that while un-seating implies the removal of someone from their current position, its antonyms all suggest giving agency or control to someone else.