Answered
substance painter Layout/Interface Dual Monitor
Can I use the 2D/3D screen separately when using the dual monitor as in the screen?

Can I use the 2D/3D screen separately when using the dual monitor as in the screen?

From Painter 7.4.0, If you have two monitors, then you can undock the 2D or the 3D view and move it to the second monitor like:

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