Hide sidebar on specific posts/categories

Hello, I want to hide sidebar and make the content full width on some posts... I have already set in betheme option sidebar to left to all posts.

How can I hide the sidebar on some posts in order to make the content full width.

I used this function:
add_filter( 'sidebars_widgets', 'disable_sidebar_widgets' );
function disable_sidebar_widgets( $sidebars_widgets ) {
    if (is_single(array(3449)))
        $sidebars_widgets = array( false );
            return $sidebars_widgets;
}

and this css lines


.postid-3491 .postid-3493 .postid-3495.sidebar.sidebar-1.four.columns, .ora-articol {display: none !important;}
.postid-3491 .postid-3493 .postid-3495.sections_group {width: 100% !important;}

The problem is that the sidebar is gone for all pages, not only for this ids... please give me a solution.


Have a nice day

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