MTB derailleur on road bike

[Becky]

My bike has a compact double on it, but can take a triple. My shifter still has that extra click in it for the third ring.

Mine has a trim click between the first and second click, but I can't get to the third with the way it's set up. I use that trim stop a lot while in the small ring to get the biggest range on the cassette without rubbing on the front derailleur cage.

Yours might have the same.