Increasing number of portfolio items in portfolio category no in backed builder.

Hello again staff Kriesi, I opened a topic for this issue but maybe the problem was not understood. I need to increase the number of portfolio items in the portfolio category: in the php page theme (taxonomy-portfolio_entries.php) then without using the backend builder (is not possible ;) ) but directly in the code.
how can I do? A detailed answer will be highly appreciated,
Thank you

Attach the code

                    <div class="entry-content-wrapper clearfix">

                        <div class="category-term-description">
                            <?php echo term_description(); ?>
                        </div>

                    <?php

                    $grid = new avia_post_grid(array(	'linking' 	=> '',
                                                        'columns' 	=> '4',
                                                        'contents' 	=> 'title',
                                                        'sort' 		=> 'no',
                                                        'paginate' 	=> 'no',
                                                        'set_breadcrumb' => false,
                                                ));
                    $grid->use_global_query();
                    echo $grid->html();

                    ?>
                    </div>