FCP7 - simple Canvas question

I feel like a moron asking this, but it's been about a year since I touched FCP. Now when I grab a subclip in my time line and drag it over the play head (physically moving the clip) is there anyway to set the canvas to show a frame by frame of what's passing under the playhead or is it always those two black boxes that show up.

I feel like I use to have it set up that way? But like I said it's been while and I took a break to mess with some other editing programs so maybe I'm mixing my memories up. Would love to know for sure! Thanks anyone with any info!