How to get rid of the calendar in my blog posts

Hi. Im having trouble getting rid of the calendar in my blog posts and on the page where my blog posts go. When I created the page and each post, I choose the sidebar that I made with the widgets that I want (the calendar is NOT one of them). However, the calendar and categories are the only things I see in the sidebar when I click on the menu to get to my blog page or when I click on the post through “category” or “archives”. If I click on the post itself, I get the proper sidebar that I want. How do I customize it so that the sidebar I want shows up in EVERY instance on my blog page and not just some.