Had a 22e. The post has a button release at the base. Press and hold button and unscrew. Lefty loosie, rightie tightie. If a gorilla put it on, you may need a pipe wrench to get it off. Such was the case with mine.
That post can sometimes be difficult to remove. I solved it, by buying a free standing table, on its own tripod base. Stores easily, better size, and not fixed in place. I can, if I want use the original table and post in the back, should I ever need it, as there is a post mount there too.