Show all products on one page with WooCommerce

Just add the conditional check to your functions.php file:

if( isset( $_GET['showall'] ) ){ 
    add_filter( 'loop_shop_per_page', create_function( '$cols', 'return -1;' ) ); 
} else {
    add_filter( 'loop_shop_per_page', create_function( '$cols', 'return 12;' ) );
}

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