Vegas Pro 17.0 Windows 10 Home
HP Notebook 15-db0007cy
AMD A9-9425 Dual-Core (3.1 Ghz base freq up to 3.7 burst freq, 1MB cache)
mp4s often are in "portrait" mode leaving much black border. How to make that border not appear when overlaying atop other video of a different proportion-say, "landscape"?