If you have been searching for expose setting, that name no longer exist in El Capitan.
Now it is called hot corners in Mission Control.
The steps are System Preference -> Mission Control -> Hot Corners -> Active screen corners
What are the benefits of setting active corners?
Of course you can show your friends from Windows background how cool is this gesture is able to clear the screen.
Second, you can access to your desktop easily instead of fumbling over your keyboard for the 3 key combo. The rest, go figure ;).
The step by step with figure is as shown below+
Step 1 - Go to System Preference ------------>
Step 2 - Select Mission Control ---->
Step 3 - Go to Hot Corners ---->
Good luck and have fun.
Best of regards,
Adam




