The only thing it seems to work is a CSS addition:
#main, #sidebar-primary, #sidebar-secondary {
padding-top: 2.617924em;
padding-bottom: 2.617924em;
visibility: hidden;
}
But I’d like to find the ‘page template’ solution, as I’d like to make many other different pages after the Singlepage.
Nope, I tried many other things as page templates like Elementor Full Width, etc… and I can’t manage to remove those classic WP sidebars.
http://f.cl.ly/items/1M3K222L122v0Q3d3F2O/sidebar-customify.png
Ok with new Customify version, got fixed itself.