Dimitri -
From the screen shot, it looks like the "little" video is in the PIP track... or is the violin your desktop background?
It also looks like a video downloaded from the internet... yes? If so, that's the size you downloaded.
Whatever - if you place it in a PIP track, click modify, resize it to full screen and produce that file you'll have it. You'd be aware that the "little" video is 4:3, so you may need to adjust the aspect ratio. You'd also be aware of what happens to a "little" video when you try to make it bigger (depending on the source).
Cheers - Tony
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