IE11 is a web browser, not a desktop. You can theoretically uninstall it by going to your computer's list of installed updates and removing the relevant one. That should automatically revert IE back to version 10.
However there are lots of web posts, across many forums, saying that method doesn't always work, leaving people unable to use any version of IE.
IE has always been pathetic software (which might explain why Microsoft seems about to abandon it altogether). Very few people around here use it, with Firefox probably being the most popular alternative:
https://www.mozilla.org/en-GB/firefox/new/
Perhaps it's time to ditch IE altogether and switch to a decent browser?