During video calls, Skype version 8.12 defaults to having the screen split equally between yourself and the person you’re calling. It’s bizarre, but that’s Skype since Microsoft bought it and tried to turn a video call service into a social network. There are no instructions from Skype on how to fix this, but thanks to eskachig in a Microsoft forum, here’s the equally baffling way to turn off this stupid feature:
HOW TO TURN OFF SPLIT SCREEN ON SKYPE:
Mouse over your own picture, click and drag the picture to the top bar.