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I have an MSI gs63VR Stealth Pro laptop and it only has one HDMI port and no other video ports of any kind. I'm a big gamer and I want to use a second monitor I have just to adjust music and discord without tabbing out of games. Any answers or suggestions would be helpful. Thanks! 
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Plug in the external monitor, go into settings, display, and choose extend desktop. Use the cartoon of the monitors to tell the computer how they're physically arranged relative to each other
I looked at the specs for your laptop and apparently it has a mini display-port in addition to the HDMI port. Check your laptop's User Guide.
HOWEVER there is a BIG DOWNSIDE to setting your game to Borderless Windowed Mode which is for a lot of PCs a big drop in performance.
Have you tried Discord's Overlay? Noted at https://blog.discordapp.com/redesigning-the-discord-overlay-cc31c6042d6d
I've never understood why playing in windowed mode results in lower FPS (frame rates) than playing in full screen. I've experienced that on a few games over the years. Why is windowed worse, i wonder?
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