When you turn on Compatibility View, the website you're viewing will be displayed as if you were using an earlier version of Internet Explorer.
Internet Explorer 9 Address Bar
If Internet Explorer recognizes a webpage that isn't compatible, you'll see the Compatibility View button on the Address bar.
To turn Compatibility View on, click the Compatibility View button to make the icon change from an outline to a solid color .
From now on, whenever you visit this website, it will be displayed in Compatibility View. However, if the website receives updates to display correctly in the current version of Internet Explorer, Compatibility View will automatically turn off.