Sidebar delete

Doesn’t look like Tuto has an option to turn it off, so you’ll need to do it with CSS. Install a Custom CSS plugin, eg. https://wordpress.org/plugins/simple-custom-css/

Then add this:

.mh-wrapper #main-content {
    float: none;
    width: auto;
    margin-right: 0;
    margin-left: 0;
}

.mh-sidebar {
    display: none;
}