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I have recently moved from Snow Leopard to El Capitan, and there is something I'm missing currently and hope it is a gesture I don't know.
In Snow Leopard, when looking at all your desktop (Exposés and Spaces) it was possible to get what is actually Mission control, but on all the thumbnails of the other desktops.
In a quick view, it was then possible to expand all the windows of all the desktops. I don't know how to get that with El Capitan.
Thanks
The functionality of Spaces and Exposé have been combined into Mission Control (Default shortcut is three finger swipe down, and icon 
). Mission Control changed the idea of spaces from a set number of desktops, to a horizontal line of desktops that can be created and deleted, and full screen apps. As of OSX 10.11, Mission control shows you the expose view of the current desktop, and if you hover over the "compressed" desktop bar 
it will expand to show you the desktops with proper window placement. 
.
Using the 3 finger swipe from side to side while in Mission Control view will show the expose view of the desktop/app you are viewing.
. Unfortunately for you if you rely on one action that shows all expose views across all desktops, that is no longer available in El Capitan, however with the addition of full screen apps, the usability is higher than spaces.
You are looking for mission control by gestures ?
Settings -> Trackpad ->
