Greenweb

All Pages before Posts does is move the Pages link above the Posts link in the admin menu column. So if you think Pages are more important to your site then Posts this plugin is for you.
You can even copy and paste the code from the plugin into your theme’s functions.php file if you don’t want to install another plugin

Pages before Posts

Lets put Pages First, in the admin menu that is.

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.

Pages before Posts vs Hide Admin Menu