Disable - Post search field - for non-admin roles in WP dashboard

Question

How can you disable the post search field "Search posts" - for non-admin roles in WP dashboard?

Image attached:

In my case, the non-admin role is a customer. The customer cannot and must not edit or delete any further posts which belong to other parties. Those posts the customer can view on pages as a common viewer. It's a customer. So I am asking why to show up that search field. I want to disable it.

(Example: if you advertise a flower vase, do you would then want to search for flower vases from others? Maybe some want it - but I don't want to offer that feature)

(Incidental things not relevant to answering the question: BTW, in case someone is asking: I cannot assign the common WP customer role because it does not meet the requirements. BTW, The customer is eligible to delete and view his post. Editing the own posts is possible with Elementor but not with the common WP link)

Attempts:

I tried 4 code snippets from the plugin "Code Snippets" by WPCode, but the search field "Search posts" in WP dashboard (posts) for non-admin roles stays!

// Prevent search queries

add_action(
'parse_query',
function ( $query, $error = true ) {
    if ( is_search() && ! is_admin() ) {
        $query->is_search       = false;
        $query->query_vars['s'] = false;
        $query->query['s']      = false;
        if ( true === $error ) {
            $query->is_404 = true;
        }
    }
},
15,
2

);

// Remove the Search Widget

add_action(
'widgets_init',
function () {
    unregister_widget( 'WP_Widget_Search' );
});

// Remove the search form

 add_filter( 'get_search_form', '__return_empty_string', 999 );

// Remove the core search block

add_action(
'init',
function () {
    if ( ! function_exists( 'unregister_block_type' ) || ! class_exists( 'WP_Block_Type_Registry' ) ) {
        return;
    }
    $block = 'core/search';
    if ( WP_Block_Type_Registry::get_instance()->is_registered( $block ) ) {
        unregister_block_type( $block );
    }
});

Answer 1

There is no straight forward documented way of removing the search box in the admin panel's Post dashboard (wp-admin/edit.php).

However, it's still possible by extending WP_Posts_List_Table class.

Additionally, it makes sense that if you remove the search box, you'd also like to disable the search capability all together (based on your requirement).

In that case, you may redirect any search request to the default wp-admin/edit.php page. That'll effectively disable any manual search attempts.

Following is a fully functional example plugin code that demonstrates how this can be implemented:

<?php
/**
 * Plugin Name: @fayaz.dev Remove post search in dashboard
 * Description: Remove post search option in wp-admin/edit.php for users who don't have the capability to edit other's posts. 
 * Author: Fayaz Ahmed
 * Version: 1.0.0
 * Author URI: https://fayaz.dev/
 **/

namespace Fayaz\dev;

function init_search_box_removal() {
    if( is_admin() && ! wp_doing_ajax() && ! current_user_can( 'edit_others_posts' ) ) {
        // disable search capability
        if( isset( $_REQUEST['s'] ) ) {
            wp_safe_redirect( admin_url( 'edit.php' ) );
            exit;
        }

        // remove the search box
        add_filter( 'wp_list_table_class_name', '\Fayaz\dev\define_wp_posts_list_table', 10, 2 );
    }
}
add_action( 'set_current_user', '\Fayaz\dev\init_search_box_removal' );

function define_wp_posts_list_table( $class_name, $args ) { 
    if( $class_name === 'WP_Posts_List_Table' ) {
        class WP_Posts_List_Table_Search extends \WP_Posts_List_Table {
            // this just overrides WP_List_Table::search_box() method.
            // the overriding function here does nothing,
            // hence it effectively removes the search box
            public function search_box( $text, $input_id ) {}
        }
        return '\Fayaz\dev\WP_Posts_List_Table_Search';
    }
    return $class_name;
}