Remove Pagination for Product Category Pages WooCommerce

Try below code to display all products in same page

add_filter( 'loop_shop_per_page', 'new_loop_shop_per_page', 20 );

function new_loop_shop_per_page( $cols ) {   
  // Return the number of products you wanna show per page.
  $cols = -1;
  return $cols;
}

Add this code to your functions.php file. Hope this helps.