There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Please stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions prefer the other forums within the support section. Before you post please read how to get help
A workspace changer is not installed by default in Mint. If you've added it to the panel and it does not work you may have to remove it from the panel and put it back on again. Scrolling the desktop rotates the cube.... or scrolling a window list - sorry not all window lists.....
Don't fix it if it ain't broken, don't break it if you can't fix it