How to fully enable Xfce windows snapping
For any excessively tidy people, windows snapping is a must; Xfce is a great desktop environment that provides such features.
By default though, it seems that only horizontal snapping works and you'd have to tweak the settings a bit to make vertical snapping function as well.
Software
Setting
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Go to Settings > Window Manager > Advanced
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and uncheck "Wrap workspaces when dragging a window off the screen"
Happy snapping!