How can OBS record the screen in order to react to videos in the stream?

Al
1

I'm watching a streamer and she wants to react to a video on YouTube and says she has only set it so that she can record Minecraft at the moment. What does she have to set so that she can virtually record the screen so that you can see the video in the stream that she wants to react to?

an

From 5:45 p.m. He shows you how to insert it as a source:

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