remove wp floating submenu in wp dashboard

I Successfully Solved it and done making The Requirement in easy way ‘that’s i found for now’

i added a js file inside my theme folder with this name “admin.js”
i called this file from theme function with this code
// replace # with js file link

// custom admin menu js
  add_action( 'admin_enqueue_scripts', 'my_enqueue' );
  function my_enqueue() {
    if(is_admin()){
        
        wp_register_script( 'custom-js', 'my js file link');
        wp_enqueue_script('custom-js');
    
        
  }
}

// style for removing floating submenu and make it inside sidbbar

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

$('#adminmenu .wp-not-current-submenu .wp-submenu').append(`<style>
   #adminmenu .wp-not-current-submenu .wp-submenu {
       position: relative;
       min-width:auto;
       left:auto;
       top: auto;
       box-shadow:none;
       display:none;
    }
    </style>`);

// this Code to make menu show/ hide the submenu on click

$('#adminmenu > li.wp-has-submenu').click(function(e) {  
        
        // element to toggle
        var $el = $('ul',this); 

        // after clicking any other menu item slide up other elements
        $('#adminmenu > li.wp-has-submenu > ul').not($el).slideUp(); 

        // toggle element
        $el.stop(true, true).slideToggle(400); 
        return false;
    });

    // stop events from bubbling from sub menu clicks
    $('#adminmenu > li.wp-has-submenu > ul > li').click(function(e) {
        e.stopPropagation(); 
    });

});  // end of jquery code