2 of my Main Menu tabs show Blog Sidebar

Originally I had my Blog split into 3 pages (categories). News/Events, Blog, Borderland Member News. I found a news widget so now the News/Events and Borderland Member News is under the "News Widget" and Blog is separate as a Blog category. If I go to the News/Events or Borderland Member News tabs they look nice. I have the layout set to no sidebar and content width. My problem is if I click on any of my News posts the Blog sidebar shows up on the right side. This happens in both News/Events and Borderland Arts News. Can you tell me how to turn off the sidebar once I am inside the posts? ... I still want the sidebar to show up on the Blog page just not these other 2 pages. Thanks -