Hi there,

To hide the sidebar only on single posts, add this CSS to Custom CSS:

.single-post .sidebar {
    display: none;
}

Hi Johan,

Please add this code below to your Custom CSS area:

body.single-post .col-lg-3 {
    display: none;
}
body.single-post .col-lg-9 {
    width: 100%;
}

Now it should work

Have a nice day!