UPDATE: The old question applies only to IE11 preview; browser mode had returned in final release of IE11. But there is a catch: it is next to useless, beca
You can work around this by setting the X-UA-Compatible
meta header for the specific version of IE you are debugging with. This will change the Browser Mode to the version you specify in the header.
For example:
In order for the Browser Mode to update on the Developer Tools, you must close [the Developer Tools] and reopen again. This will switch to that specific version.
Switching from a minor version to a greater version will work just fine by refreshing, but if you want to switch back from a greater version to a minor version, such as from 9 to 7, you would need to open a new tab and load the page again.
Here's a screenshot: