I am currently experiencing a problem where when I press the plus button in the explorer to add a new object the options appear on my second monitor (the monitor without Roblox Studio open)
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Have the Explorer Tab open on left docking area of Roblox Studio (Is not replicable on right docking area)
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Hit the plus button next to any object
[In the image the red line divides where the 2 monitors are]
I tested with placing Roblox Studio on both monitors, and in both cases it appeared on the opposite monitor. It also happened while Roblox Studio was full screened and windowed.