You can easily remove Dashboard’s left sidebar links and add them on the top after the WP admin bar. This not only saves your dashboard space but also makes admin area navigation more easy for you.
By default your WordPress dashboard shows a left sidebar where you have all admin links from adding new posts to changing layout, installing plugins and managing all settings across your website. It takes lot of space, specially while writing new blog posts.
So for removing it from the left and adding all its links on the top horizontal bar, install and activate Ozh’ Admin Drop Down Menu plugin and that’s all. Enjoy your new horizontal bar showing all your backend menus and links on the top.