How to show menu only in wordpress page? WordPress

Let me tell you that how to show menu only in wordpress page only and to hide on post?

Step 1:

write the following code in functions.php as shown in the figure below;

function register_custom_sidebars() {
    // Register a sidebar for posts
    register_sidebar( array(
        'name' => __( 'Post Sidebar', 'textdomain' ),
        'id' => 'post-sidebar',
        'description' => __( 'Sidebar for posts', 'textdomain' ),
        'before_widget' => '<div id="%1$s" class="widget %2$s">',
        'after_widget' => '</div>',
        'before_title' => '<h3 class="widget-title">',
        'after_title' => '</h3>',
    ) );
    
    // Register a sidebar for pages
    register_sidebar( array(
        'name' => __( 'Page Sidebar', 'textdomain' ),
        'id' => 'page-sidebar',
        'description' => __( 'Sidebar for pages', 'textdomain' ),
        'before_widget' => '<div id="%1$s" class="widget %2$s">',
        'after_widget' => '</div>',
        'before_title' => '<h3 class="widget-title">',
        'after_title' => '</h3>',
    ) );
}
add_action( 'widgets_init', 'register_custom_sidebars' );

Step 2:

write the following code in sidebar.php as shown in the figure below;

how to show different sidebars for post and page

if ( is_single() && get_post_type() == 'post' ) {
    dynamic_sidebar( 'post-sidebar' );
} elseif ( is_page() ) {
    dynamic_sidebar( 'page-sidebar' );
} else {
    dynamic_sidebar( 'default-sidebar' );
}

Step 3:

Go to Appearance – > widgets and select the menu for “page sidebar” only.