Getting rid of the sidebar in posts

Hi when I first started I created my theme and layout to have a sidebar in my blog posts.
Now I need to remove it.
In classic mode I just deleted the elements and the sidebar is gone.
I publish the page and it looks all good.
Now I want to edit the pages in block mode, using beaverbuilder but the second I do that the sidebar comes back in beaverbuilder mode even if it is blank.

I can;t figure out how to remove that sidebar.