gnome-control-center
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Customise number of fingers for gestures
Cosmic has some great gesture support but it would be even better if the settings dialog allowed changing the number of fingers that are used for these gestures (at least between three and four).
There are probably some UX decisions to make before exposing those settings. In the meantime, you can customize Touchegg settings with an app called Touché which is available in Pop Shop
I installed Touché but it wasn't apparent to me how to actually hook up the three finger event to changing workspaces. And the 4-finger settings are just "used by gnome" which is not very helpful ^^