WooCommerce Subscriptions – disable the ability to remove line items within subscriptions. This template override should be uploaded at: .../wp-content/themes/{your-theme}/woocommerce/myaccount/subscription-totals-table.php

subscription-totals-table.php

<?php
/**
 * OVERRIDE: Subscription details table
 * Remove the 'x' option within subscriptions on the My Account page
 *
 * @author  Prospress / @jrick1229
 * @package WooCommerce_Subscription/Templates
 * @since 1.0.0 - Migrated from WooCommerce Subscriptions v2.6.0
 * @version 1.0.0 - Migrated from WooCommerce Subscriptions v2.6.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}
?>
<table class="shop_table order_details">
	<thead>
		<tr>
			<th class="product-name"><?php echo esc_html_x( 'Product', 'table headings in notification email', 'woocommerce-subscriptions' ); ?></th>
			<th class="product-total"><?php echo esc_html_x( 'Total', 'table heading', 'woocommerce-subscriptions' ); ?></th>
		</tr>
	</thead>
	<tbody>
		<?php
		foreach ( $subscription->get_items() as $item_id => $item ) {
			$_product  = apply_filters( 'woocommerce_subscriptions_order_item_product', $item->get_product(), $item );
			if ( apply_filters( 'woocommerce_order_item_visible', true, $item ) ) {
				?>
				<tr class="<?php echo esc_attr( apply_filters( 'woocommerce_order_item_class', 'order_item', $item, $subscription ) ); ?>">
					
					<td class="product-name">
						<?php
						if ( $_product && ! $_product->is_visible() ) {
							echo wp_kses_post( apply_filters( 'woocommerce_order_item_name', $item['name'], $item, false ) );
						} else {
							echo wp_kses_post( apply_filters( 'woocommerce_order_item_name', sprintf( '<a href="%s">%s</a>', get_permalink( $item['product_id'] ), $item['name'] ), $item, false ) );
						}

						echo wp_kses_post( apply_filters( 'woocommerce_order_item_quantity_html', ' <strong class="product-quantity">' . sprintf( '&times; %s', $item['qty'] ) . '</strong>', $item ) );

						/**
						 * Allow other plugins to add additional product information here.
						 *
						 * @param int $item_id The subscription line item ID.
						 * @param WC_Order_Item|array $item The subscription line item.
						 * @param WC_Subscription $subscription The subscription.
						 * @param bool $plain_text Wether the item meta is being generated in a plain text context.
						 */
						do_action( 'woocommerce_order_item_meta_start', $item_id, $item, $subscription, false );

						wcs_display_item_meta( $item, $subscription );

						/**
						 * Allow other plugins to add additional product information here.
						 *
						 * @param int $item_id The subscription line item ID.
						 * @param WC_Order_Item|array $item The subscription line item.
						 * @param WC_Subscription $subscription The subscription.
						 * @param bool $plain_text Wether the item meta is being generated in a plain text context.
						 */
						do_action( 'woocommerce_order_item_meta_end', $item_id, $item, $subscription, false );
						?>
					</td>
					<td class="product-total">
					<?php echo wp_kses_post( $subscription->get_formatted_line_subtotal( $item ) ); ?>
					</td>
				</tr>
				<?php
			}

			if ( $subscription->has_status( array( 'completed', 'processing' ) ) && ( $purchase_note = get_post_meta( $_product->id, '_purchase_note', true ) ) ) {
				?>
				<tr class="product-purchase-note">
					<td colspan="3"><?php echo wp_kses_post( wpautop( do_shortcode( $purchase_note ) ) ); ?></td>
				</tr>
				<?php
			}
		}
		?>
	</tbody>
		<tfoot>
		<?php
		foreach ( $totals as $key => $total ) : ?>
			<tr>
				<td><?php echo wp_kses_post( $total['value'] ); ?></td>
			</tr>
		<?php endforeach; ?>
	</tfoot>
</table>