The 'Reverse selected' toggle reverses the meaning of the toggles above it.
Assume you have select all toggles except the 'Color' toggle.
If 'Reverse' if OFF all properties except the color will be matched.
If 'Reverse' is ON only the color will be matched.
A reverse button that actually switches the toggles would have made more sense.
It may be a nice challenge for you to try to implement that...