Steve Carell left The Office when he did because he didn’t want to get too comfortable in the position. It wasn’t that he didn’t like the show or was done with it already, Carell just felt like it was time to leave if he was going to do anything else. Sometimes it’s time to try something new, and thankfully he did because now we have so many great movies he worked on instead! This TV show really launched his career, and leaving the show gave him time to work on other things.