You need to add where when people want to check their work out it's not cut off where you CAN'T see the full video. You guys should add an update where you could make the video where you could make the video full screen, and before exporting it. I have a picture showing you, what I mean.
Mod note: I changed your title slightly.
I saw your note. Do you think you can try scaling down the image to fit the sequence using the Crop and Rotate tool > Maintain Proportions? That may be the issue. It's hard to tell from that screenshot, however. Let us know if scaling the image down helps.