Restore wp-admin menu and bar visibility on NF3+ screens.

nf-display-tweak.js

jQuery( document ).ready( function( $ ) {

	// Container
	$( '.wp-admin.ninja-forms-app #nf-pre-builder' ).css( 'position', 'relative' );
	$( '.wp-admin.ninja-forms-app #nf-pre-builder' ).css( 'top', '32px' );
	$( '.wp-admin.ninja-forms-app #nf-pre-builder' ).css( 'left', '100px' );

	// Restore menus
	$( '.wp-admin.ninja-forms-app #nf-builder' ).css( 'z-index', '1' );
	$( '.wp-admin.ninja-forms-app #nf-builder' ).css( 'top', '32px' );
	$( '.wp-admin.ninja-forms-app #nf-builder' ).css( 'left', '160px' );
	$( '.wp-admin.ninja-forms-app #nf-builder' ).css( 'box-shadow', 'none' );

	// Restore admin menus and footer
	$( '.wp-admin.ninja-forms-app #adminmenumain' ).css( 'display', 'block' );
	$( '.wp-admin.ninja-forms-app #wpfooter' ).css( 'display', 'block' );
} );

nf-display-tweak.php

<?php
/**
 * Plugin Name: Ninja Forms Admin Bar and Menu Visibility
 * Plugin URI: https://dennys.com
 * Description: Restores the WordPress admin menu, and menu bar, in wp-admin on NF 3+ screens.
 * Author: ramiabraham
 * Author URI: https://dennys.com
 * Version: 1.0
 * Text Domain: nf-display-tweak
 * Domain Path: languages
 *
 * This plugin is distributed under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * any later version.
 *
 * This code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 */

function dennys_nf_display_tweak() {

    $screen    = get_current_screen();
    $screen_id = $screen->id;

    $src = plugins_url( 'nf-display-tweak.js', __FILE__ );

    wp_register_script( 'nf-display-tweak', $src, array( 'jquery' ), null, true );

    if ( $screen_id === 'toplevel_page_ninja-forms' ) {

        wp_enqueue_script( 'nf-display-tweak' );
    }
}

add_action('admin_enqueue_scripts', 'dennys_nf_display_tweak', 9999 );

The canonical URL is https://www.dennys.com/ not https://dennys.com 😀