Go to the Xfce settings and look for the display icon.
There you can set that you do not want to mirror your displays and that is all you need to do.
You can use this also on openbox but not on i3.
11 – Setting your dual screen in Xfce
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An Arch-based Linux distribution, without the setup.
ArcoLinux brought you here. Kiro is where the journey continues — same hands, same teacher, same love for Arch, now built for the community from the ground up.
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