[Theme Horse Support Team]

Hi pavlo.golub,

Thanks for your condolences and praying for our country.

Yes get_header() will outputs the slider which is set for home page. You need to create a child theme and first unhook the functions and then you need to customize the code. There will be a a bit more code of customization so you need to hire a developer to fix it.
example to unhook :-
unhook functions

// Unhook default Thematic functions
function unhook_thematic_functions() {
    // Don't forget the position number if the original function has one

remove_action( 'interface_404_content', 'interface_display_404_page_content', 10 );

}
add_action('init','unhook_thematic_functions'); // removes the header content by using hook interface_header

add_action( 'interface_404_content', 'interface_child_display_404_page_content', 10 );
 
function interface_child_display_404_page_content() {      ?>   
<div id="content">
		<header class="entry-header">
			<h1 class="entry-title"><?php _e( 'Error 404-Page NOT Found', 'interface' ); ?></h1>
		</header>
		<div class="entry-content clearfix" >
			<p>Thank you</p> 
		</div><!-- .entry-content -->
	</div><!-- #content -->
  <?php 
}

Thank you!