We can set add to cart limit on WooCommerce cart using woocommerce_add_to_cart_validation filter. Add below code on functions.php file to limit your WooCommerce Cart to just 1 product.
<?php
add_filter( 'woocommerce_add_to_cart_validation', 'cxc_woocommerce_only_one_product_in_cart', 99, 2 );
function cxc_woocommerce_only_one_product_in_cart( $passed, $added_product_id ) {
wc_empty_cart(); /* For make cart empty. */
return $passed;
}
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