This allows you to disable pickup option when product from specific categories are in the cart, in below example we have used category 19, 36

disable-pickup-for-category.php

add_filter('pisol_dtt_setting_filter_pi_type', function( $val ){

	$disable_pickup_for_category = [19];

	if ( ! did_action( 'wp_loaded' ) ) return 'Both';

	
	if(function_exists('WC') && isset(WC()->cart) && is_object(WC()->cart)){
		foreach( WC()->cart->get_cart() as $cart_item ) {
			$product_in_cart = $cart_item['product_id'];
			if(has_term($disable_pickup_for_category, 'product_cat', $product_in_cart)){
				return 'Delivery';
			}
		}
	}
	return $val;
});