Translations:System Settings/Shortcuts and Gestures/7/en
Right click on the left pane (in an empty area under the list of action groups) and choose , rename that group to "Mouse Gestures" and check the checkbox attached to its name.
Right click on the left pane (in an empty area under the list of action groups) and choose New Group, rename that group to "Mouse Gestures" and check the checkbox attached to its name.