https://www.displayfusion.com/Discussions/RSS/?TopicID=4914f52e-e15a-42c4-b714-a76c6d498a00 DisplayFusion RSS: Span monitors undefined behavior? Sat, 18 Apr 2026 08:36:53 GMT en hourly 1 https://www.displayfusion.com/Discussions/RSS/?TopicID=4914f52e-e15a-42c4-b714-a76c6d498a00 https://www.displayfusion.com/Discussions/View/span-monitors-undefined-behavior/?ID=4914f52e-e15a-42c4-b714-a76c6d498a00#3 Tue, 03 Dec 2013 20:24:55 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/span-monitors-undefined-behavior/?ID=4914f52e-e15a-42c4-b714-a76c6d498a00#3 DisplayFusion Yeah, the span Function gets a bit confused when vertically oriented monitors are added into the mix. The best way to work around this is to create a custom Function for the spanned size, and then add that as a TitleBar Button instead ]]> https://www.displayfusion.com/Discussions/View/span-monitors-undefined-behavior/?ID=4914f52e-e15a-42c4-b714-a76c6d498a00#2 Tue, 03 Dec 2013 17:36:55 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/span-monitors-undefined-behavior/?ID=4914f52e-e15a-42c4-b714-a76c6d498a00#2 DisplayFusion Here's my monitor selector. ]]> https://www.displayfusion.com/Discussions/View/span-monitors-undefined-behavior/?ID=4914f52e-e15a-42c4-b714-a76c6d498a00 Tue, 03 Dec 2013 17:36:08 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/span-monitors-undefined-behavior/?ID=4914f52e-e15a-42c4-b714-a76c6d498a00 DisplayFusion Keith,

I have four monitors, one of which is above the others. When I use the span function, I get a skinny window on my primary.

What I would expect is that the span function would find the maximum width it could create going from the current monitor right and left, then find the maximum height span on the found maximum width axis. I would expect it to ignore monitors not aligned with the current monitor.

Attached is my actual result, the window highlighted in purple.
I've also attached what I expected and my monitor selector to clarify my layout. ]]>