Yutaka Emura

I am sorry there is no information at Help about this option yet. It only means that if you check “Right Side” check box for a particular highlight word, the highlight will be in effect at the right side up to the window border (if no wrap or wrap by window is selected) or specified width or page width. If this is not checked, the right side highlight will occur only up to the word wrapped position. You should try it to see how it works.