How do I remove right sidebar on the product page?

delete from css

@media (min-width: 768px) {
    .single-product #right-sidebar {
        float: right;
    }

    .single-product div.product .woocommerce-tabs,
    .single-product div.product .related.products,
    .single-product div.product .upsells.products {
        width: 66%;
        display: inline-block;
    }
}

and delete Woo Single Product Sidebar from elements for anyone else having trouble

Hi there,

sounds like you found the issue and solution. Let me know if not.