In Internet Explorer 11, you can see if Compatibility Mode is set by clicking on the gear in the upper right-hand corner of the browser and selecting "Compatibility View settings".
In the window that pops up, you can see if Compatibility Mode is turned on by seeing if "Use Microsoft compatibility lists" is checked.
You can also set specific websites to use Compatibility View here as well.
NOTE: Many of our products do not support IE 11. It is recommend that you view the System Requirements for products you own to see which browsers are compatible.