// Remove "Select options" button from (variable) products on the main WooCommerce shop page.
add_filter( 'woocommerce_loop_add_to_cart_link', function( $product ) {

	global $product;

	if ( is_shop() && 'variable' === $product->product_type ) {
		return '';
	} else {
		sprintf( '<a href="%s" data-quantity="%s" class="%s" %s>%s</a>',
			esc_url( $product->add_to_cart_url() ),
			esc_attr( isset( $args['quantity'] ) ? $args['quantity'] : 1 ),
			esc_attr( isset( $args['class'] ) ? $args['class'] : 'button' ),
			isset( $args['attributes'] ) ? wc_implode_html_attributes( $args['attributes'] ) : '',
			esc_html( $product->add_to_cart_text() )
		);
	}

} );