Access the hidden handles of a clip that is in the background

Hello,

Is it possible to access the hidden handles of a clip that is in the background? Example: I have a clip in the background that is too long on one side. To shorten it, I have to put it in the foreground: it’s a move too much. I need to be able to directly access the handle that is behind to shorten it. I hope my explanation in English is clear.

Use lanes mode.