multiple monitors

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    3 monitors on MacPro, LR is jumping around

    Hi, I have a set-up with 3 monitors on a Mac Pro 2013. I would like to lock the main LR window to the center monitor, but is is jumping around, depending on what else I do, rather unpredictably. When it is on my left monitor, it fills the whole screen so I cannot move it, I have to restart LR...