Remove the Quick Launch in SharePoint Online

There are two ways to remove the Quick Launch in SharePoint 2013.

1. The first is to open the site in Share Designer, and uncheck the option to “Display Quick Launch”. While this works, it doesn’t move the content to the left. You’re left with an empty space that doesn’t look great.

    2. Alter the CSS using a Script Editor web part. Place a Script Editor webpart anywhere on the page, and         add the following code. The first line removes the Quick Launch. The second line moves the code all             the way to the left.

<style>
.ms-core-navigation { DISPLAY: none }
#contentBox { margin-left: 0px }
</style>