manimotion

Even changing the Theme – to Twenty Twenty One did not help

Excuse me, I didn´t recognise this rule.
Here is the content of search.php in TwentySeventeen

<?php
/**
 * The template for displaying search results pages
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/#search-result
 *
 * @package WordPress
 * @subpackage Twenty_Seventeen
 * @since Twenty Seventeen 1.0
 * @version 1.0
 */

get_header(); ?>

<div class="wrap">

	<header class="page-header">
		<?php if ( have_posts() ) : ?>
			<h1 class="page-title">
			<?php
			/* translators: Search query. */
			printf( __( 'Search Results for: %s', 'twentyseventeen' ), '<span>' . get_search_query() . '</span>' );
			?>
			</h1>
		<?php else : ?>
			<h1 class="page-title"><?php _e( 'Nothing Found', 'twentyseventeen' ); ?></h1>
		<?php endif; ?>
	</header><!-- .page-header -->

	<div id="primary" class="content-area">
		<main id="main" class="site-main">

		<?php
		if ( have_posts() ) :
			// Start the Loop.
			while ( have_posts() ) :
				the_post();

				/**
				 * Run the loop for the search to output the results.
				 * If you want to overload this in a child theme then include a file
				 * called content-search.php and that will be used instead.
				 */
				get_template_part( 'template-parts/post/content', 'excerpt' );

			endwhile; // End the loop.

			the_posts_pagination(
				array(
					/* translators: Hidden accessibility text. */
					'prev_text'          => twentyseventeen_get_svg( array( 'icon' => 'arrow-left' ) ) . '<span class="screen-reader-text">' . __( 'Previous page', 'twentyseventeen' ) . '</span>',
					/* translators: Hidden accessibility text. */
					'next_text'          => '<span class="screen-reader-text">' . __( 'Next page', 'twentyseventeen' ) . '</span>' . twentyseventeen_get_svg( array( 'icon' => 'arrow-right' ) ),
					/* translators: Hidden accessibility text. */
					'before_page_number' => '<span class="meta-nav screen-reader-text">' . __( 'Page', 'twentyseventeen' ) . ' </span>',
				)
			);

		else :
			?>

			<p><?php _e( 'Sorry, but nothing matched your search terms. Please try again with some different keywords.', 'twentyseventeen' ); ?></p>
			<?php
				get_search_form();

		endif;
		?>

		</main><!-- #main -->
	</div><!-- #primary -->
	<?php get_sidebar(); ?>
</div><!-- .wrap -->

<?php
get_footer();

Good Morning,
Admin Search on my desktop works fine.
Even the plugin Relevanssi is running in active mode.
The admin search on my mobile samsung galaxy S23 does not give me a chance to fill in a search term. It is the same wether the plugin is in active or troubleshoot mode.
Deleted the “Health Check & Troubleshooting” plugin.
No Troubleshoot mode is available now.
The search does not show results

To see results please check
https://carlos-weber.eu/?s=manfred