Problem with Sidebar on the Category pages

I check full width in the theme options, but the sidebar is still visible.
Everything is fine on the home page,
but the category pages still show the sidebar

Hi, @nylecm

The settings you have applied refer to the category pages like this one:

This is a single post:

You can disable the sidebar for the single posts by editing each post individually and assigning the preferred layout for it in the Post Layout section.