How do I put the PDF on monitor 3 and MDF on 4

I have 2 monitors on my system and I want to put the PDF on monitor 3 and the MDF on monitor 4. Holding the right Alt key and clicking on the display creates a view for the PDF. When I click on the MDF in is placed on the same monitor next to the PDF. I can manually arrange the main window and get one per monitor, but it would be better in the PDF and MDF were 2 independent windows. Wondered if holding a second key would do the trick, like alt plus shift or something like that

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