Front Page post summary doesn't work

Hi everybody,
I’m trying to customize my homepage (in multisite): I just want to show the SUMMARY of the latest 10 posts in one of my homepages. So I set this option in administration “setting> reading”, but it doesn’t work. It’s still showing full text of only 2 posts.

This is my home.php file:

<?php get_header(); ?>
			<?php get_sidebar('top'); ?>

<div class="content-layout">
    <div class="content-layout-row">
    <div class="layout-cell" style="width: 50%" >
        <?php theme_get_next_post(); ?>
    </div><div class="layout-cell" style="width: 50%" >
        <?php theme_get_next_post(); ?>
    </div>
    </div>
</div>
<div class="content-layout">
    <div class="content-layout-row">
    <div class="layout-cell" style="width: 50%" >
        <?php theme_get_next_post(); ?>
    </div><div class="layout-cell" style="width: 50%" >
        <?php theme_get_next_post(); ?>
    </div>
    </div>
</div>

What I should do?

Thank’s.