Start the game always on the main display - Unity Forum
Steam Community :: Video :: Running Unity games on a linux dual monitor setup
Unity 5.2 Released, Brings in Multi-Monitor Support
Unity - Manual: Multi-display
My multi-monitor support is broken. How can I fix this? - Questions & Answers - Unity Discussions
If CG is switching to Unity, we can possibly hope for a PC version at some point. I can even imagine how it will look on an ultrawide monitor. : r/SWGalaxyOfHeroes
Unity - How to change editor play/stop button positions for dual monitor layout - Game Development Stack Exchange
Unity3D Editor window on multi monitor setup - Unity Forum
Multi Monitor Display (What it is and how to include in your Unity Games)
Two Monitors : Unity 3D : One Main Window and Mobile Sub-Windows
What does your Unity window layout look like? - Unity Forum