Scott Kingsley Clark

This plugin ensures that whatever page you are on in the WordPress Dashboard, you will always see that page’s menu item at the very top of the menu.
If you have a large amount of menu items and you are constantly scrolling down to the bottom of the menu to get to the page you are on — this plugin will help you out by making the current menu item stick to the top.

Sticky Admin Menu

A simple plugin that sets the current admin page to always be at the top of the admin menu.

Bhavin Thummar

This plugin gives the facility for hiding and showing the admin menu of the side and top bars.
This plugin gives an easy way to hide admin menus by checking the checkbox of a particular menu in the form and then submitting the form so that checked menus hide from the admin.
Admin also can hide menu according to the role of users.
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Hide Admin Menu

Working FIne

Using this plugin, we can hide the admin menu easily.

Sticky Admin Menu vs Hide Admin Menu