Code snippet that adds Back to Products/Shop button on Single Product Template

functions.php

<?php

// Add "Back to Shop" button on Single Product Template
// Sometimes it is useful a button to get back to Shop page
add_action('woocommerce_before_single_product', 'print_back_to_products_btn');
function print_back_to_products_btn() {
	$shop_page_url = get_permalink(woocommerce_get_page_id( 'shop' ));
	echo '<a style="margin-bottom: 10px" class="button" href="' . $shop_page_url . '"><i class="fas fa-arrow-left"></i> All Products</a>';
}