how to change the display in settings?

So I have a computer monitor, that can double as a TV, and it has no speakers. So when I put in disks in my disk player connected to it, I have to plug in external computer speakers. I plugged the HDMI cord into my laptop and it shows my computer screen on the monitor. But the problem is that my videos won't play when I want to watch netflix or youtube through it.But when I plug in the HDMI cord it says "HDMI (Display port) Audio + Video" so how, in my settings or something, get it to change the display and take off the audio on it. My monitor has no speakers, like I said. OH, and the sound works when the HDMI cable is hooked up and I plug in the computer speakers to my computer, in audio manager. but nowhere else.

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