A Content Template was created for a custom post type in Toolset, but the page still displayed a sidebar. There was no option inside the Content Template editor to choose a page layout such as full width, left sidebar, or right sidebar.
Solution:
Toolset Content Templates do not control the overall theme layout. The sidebar is added by the active theme or Elementor Theme Builder, so the layout must be changed there instead. If the theme does not offer a setting to remove the sidebar, the theme template (such as single-{posttype}.php) needs to be adjusted to use a full-width layout and remove the sidebar call.