xfce4-display-settings crashes with floating point error when monitor configuration exceeds Xorg Virtual display size. https://forum.xfce.org/viewtopic.php?pid=51197
$ xfce4-display-settings --version xfce4-display-settings 4.12.4 (Xfce 4.12)
Since you are using Arch, can you try xfce4-settings-devel from AUR?
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