Selected dropdown option is not getting saved in the DB [duplicate]

Question

I am building a function within my plugin where I have the list of available pages being displayed.

What I want is for whenever a user selects a page from the dropdown, it should save the slug of the page as a value in my option name of page_for_logged.

I have tried with the below code, but whenever I click on Save, the selected page is not getting saved in the DB. Also, from the frontend too, it's getting unselected and getting back to its default option. Can anyone please assist with this? Thanks!!

function rudr_slider_page_callback(){
    ?>
    
    <div class="wrap">
    <h1><?php echo esc_html( "Select Page" ); ?></h1>
    </div>
    </br>
    </br>    
    <?php
    print(
        __( 'Homepage for Logged IN user: ' ));
    ?>
    </br>
    </br>

<?php
                $nonceUrl = wp_nonce_url(admin_url('admin.php?page=rudr_slider'));
            ?>
            <form method="post" action="<?php echo esc_url($nonceUrl) ?>" enctype="multipart/form-data">

                <div class="rw">
                    <div class="col60">
                        
                        <input type="hidden" name="action" value="page_for_logged">

                        <p><label style="display: block; margin-bottom: 5px;">How to join call page?</label>
                            <select name="page_for_logged_in" style="border-radius: 5px; min-width: 300px; padding:6px 12px;" required>
                                <option>--</option>
                                <?php 
                                $selectedpagee = get_option('page_for_logged_in');
                                query_posts(array('post_type'=>'page', 'posts_per_page'=>'-1'));
                                if( have_posts() ){
                                    while (have_posts()) {  the_post();

                                        $post_id = get_the_ID();
                                        $pslug = get_post_field( 'post_name', $post_id );
                                        ?>
                                        <option value="<?php echo esc_attr($pslug); ?>" <?php if($selectedpagee == $pslug){ echo esc_attr('selected'); } ?> ><?php the_title(); ?></option>
                                        <?php

                                    }
                                }
                                wp_reset_query();
                                ?>
                            </select></p>

                        <BR>
                        <p><input type="submit" value="Save changes" style="border-radius: 5px; cursor: pointer; background: #000; color: #fff; border:none;padding: 6px 13px;"></p>

                    </div>
                </div>

            </form>

        </div>

    <?php
}