Okay, so I used to be able to figure this out just fine. However, with the Full Monty desktop (2012.9) version it doesn't seem to be as intuitive (to me). The best answer I've been able to find in the forums is as follows:
1. right click on any unused portion of the desktop. In the box choose "Unlock Widgets.
2. Click on the cashew at the right end of the taskbar.
3. Click on More settings.
4. Click on auto hide.
5. click on the desktop again as in step 1 and now choose "Lock Widgets"
However, I don't see a "More" settings anywhere. If I right click, all I see is "Add Panel" and "Lock Widgets". If I'm supposed to left click, I have no idea where to do that. I've even looked under "Smooth Tasks Settings" by right-clicking on the task bar in hopes that I could find it there, but to no avail. Sorry if this is a stupid question and staring me right in the face!