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3 monitors on MacPro, LR is jumping around


New Member
Apr 12, 2019
Lightroom Version
Operating System
macOS 10.14 Mojave

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. It seems to have gotten worse with Mojave.
Is there a way to lock the LR main window to a specific monitor?
Jul 2, 2015
Lightroom Experience
Power User
Lightroom Version
If Lightroom locks on a certain screen, it is running in Full Screen mode on that monitor. Hovering the cursor over the top edge pf the screen should reveal the menu, where you can select 'Window - Screen Mode - Normal. Or press Cmd-Option-N.

This is a long standing problem with Lightroom running on a system with more than two monitors. I don't think there is a way to really lock Lightroom to one of the screens.