Preview Window not showing entire video frame

I'm wondering if anyone else has noticed that while editing, some of your video in the preview window is not showing. Depending on my VIRB Edit window size there is usually some of the top/bottom or left/right portion of my video being clipped. If I play around with the window size, I can sometimes get that exact 16:9 ratio so that all of my video shows.

I feel I shouldn't have to do this and the preview window should automatically resize to a 16:9 ratio to always show 100% of my clip.

Does anyone else see this?

Thanks!