Wehn you say suppress you mean remove?
If yes, open “sidebar-browse.php” and find:
wp_nav_menu( array( 'container' => '', 'theme_location' => 'mini-first', 'items_wrap' => '<ul class="normal-list"><li class="'. $page_state .'"><a href="'. esc_url( home_url() ) .'" title="'. __('Go Home', 'acosmin') .'">'. __('Main Page', 'acosmin') .'</a></li>%3$s</ul>' ) );
replace with:
wp_nav_menu( array( 'container' => '', 'theme_location' => 'mini-first', 'items_wrap' => '<ul class="normal-list"><li class="'. $page_state .'"></li>%3$s</ul>' ) );
To remove Archives and Calendar delete these lines:
<aside class="side-box">
<h3 class="sidebar-heading"><?php _e( 'Archives', 'acosmin' ); ?></h3>
<nav class="sb-content clearfix">
<ul class="normal-list">
<?php wp_get_archives( array( 'type' => 'monthly', 'limit' => 12 ) ); ?>
</ul>
</nav><!-- END .sb-content -->
</aside><!-- END .sidebox -->
<div class="side-box larger">
<h3 class="sidebar-heading"><?php _e( 'Calendar', 'acosmin' ); ?></h3>
<div class="sb-content clearfix">
<?php get_calendar(true); ?>
</div><!-- END .sb-content -->
</div><!-- END .sidebox -->