Hello,
Try to use the next code in functions.php of your child theme:
add_action('wp', 'etheme_custom_template_hooks', 70);
function etheme_custom_template_hooks() {
remove_action( 'woocommerce_widget_shopping_cart_buttons', 'woocommerce_widget_shopping_cart_proceed_to_checkout', 20 );
add_action( 'woocommerce_widget_shopping_cart_buttons', 'et_woocommerce_widget_shopping_cart_proceed_to_checkout', 20 );
}
function et_woocommerce_widget_shopping_cart_proceed_to_checkout() {
echo '<a href="' . esc_url( wc_get_cart_url() ) . '" class="button checkout wc-forward">' . esc_html__( 'Cart', 'woocommerce' ) . '</a>';
}
Regards