Hi Nicolas,

Our plugin does not allow you to change the quantity of component products directly on the Cart/Checkout page. If you enable the "Edit link" feature, an Edit button will appear on each composite product so you can return to the product details page and edit the component products.

You can check it on our demo page here: https://demo.wpclever.net/wooco/product/composite-products-04/

If you want an Edit button like that on Sidecart, please provide your website credentials (wp-admin link, username, and password), or create a development or staging site with identical configurations so I can implement it for you.

I've added this snippet for you: https://elmate.no/wp-admin/admin.php?page=edit-snippet&id=51

Now, you can see the Edit button on composite products:

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Added snippet:

add_action( 'wp_footer', function () {
    ?>
    <style>
        .fkcart-product-type-composite .fkcart-item-title-price > a {
            display: inline-block !important;
        }

        .fkcart-product-type-composite .fkcart-item-title-price .wooco-cart-item-edit {
            margin-left: 5px;
            font-size: 14px;
        }
	
		.fkcart-product-type-composite .fkcart-item-misc .fkcart-item-price {
			display: none;
		}
    </style>
    <?php
} );

add_action( 'fkcart_before_item_meta', function ( $fkcart_item ) {
    $cart_item = $fkcart_item['cart_item'] ?? [];

    if ( ! empty( $cart_item['wooco_ids'] ) ) {
        $edit_url = add_query_arg( [
                'edit' => base64_encode( $cart_item['wooco_ids'] ),
                'key'  => $cart_item['key'] ?? ''
        ], $cart_item['data']->get_permalink() );
        echo ' <a class="wooco-cart-item-edit" href="' . esc_url( $edit_url ) . '">Edit</a>';
    }
} );