Remove widget bar to make more room in the content area

How would I remove the widget bar on the right sidebar of the content section in order to create more room? I’ve tried removing everything inside the sidebar, but “archives” and “meta” widgets still show up there. I need to remove them so i can make room for a 3 column pricing table to put on one of the my inner pages. Is there any way to do this?
Sorry if someone has already addressed this issue, but I didn’t see anything else that helped me.