On websites that are two wide to display in the window, you can use a two finger gesture to scroll right, but trying to use the same gesture but to the left causes Safari to go back a page instead. Does anyone know how to turn off the behavior?
Your answers was a little vague... it appears that
System Preferences > Trackpad > More Gestures > Swipe Between Pages was the thing I was looking for... setting it to "swipe left or right with three fingers" appears to have resolved my issue.