The Lightroom workspace can have a large number of toolbars and panels active. Sometimes viewing just an image is important without all the clutter. Here are a few shortcuts to help manage the clutter. These shortcuts work in all views.
L – Cylcle the Light views
Tab – Turn on / off just the side panels
Shift Tab – Turn on / off all the panels
Don’t forget to view the shortcuts with the fantastic help system in Lightroom.