P: Ability to assign a second monitor with more than 3 monitors

Also have three monitors, also have the same problem. Surely there is a way to support triple-monitors?!?

Three years of complaining and still no fix?!?!?
OS X 10.8.4, Lightroom 5.6: as soon as I switch the secondary to full screen, it jumps to the wrong monitor. The only way to get it full screen on the right monitor is to physically disconnect the one it apparently has fallen in love with.
I suspect that it is OS X that assigns an order to the monitors, but that order is NOT based on the physical connection of the displays (even swapping connections did not help).

Just adding my voice to the list of users wanting the 2nd monitor to be configurable amongst the available screens - using three currently, and it always goes to the wrong one 😞

dragging it to the screen I want works, poorly, mainly due to reverting when LR loses focus. Adobe, I'd love to see this sorted!

Not fixed. Pretty ridiculous. Evey time you go to another program you have to move the secondary window back to another screen and resize it when you return to lightroom. It desent just stay where you leave it. It's not too sleek looking either. This is just so stupid. If the second window just acted like a regular window the problem would not be there at all. HOW HARD IS IT TO MAKE BASIC THINGS WORK, ADOBE?

Does LR remember where the secondary was placed last when you re-launch it? I'm having the same issue with LR 5.6. It's pretty amazing that this problem was reported over 3 years (and two full releases) ago by several users and nothing has been done to address a proper fix.

Hello, Adobe...anybody paying attention????

SOLUTION for NOW... (Im USING 3 Displays)
I had the same problem... I wanted to use the middle monitor as my main screen and LR secondary to open on my right monitor due to my workstation setup... I searched the internet entirely with no luck...

Solution:
To remedy this I just disabled my secondary screen from full screen mode so i could manually move it.
LR > Window (Menu) > Secondary Display > Full Screen (Shift+F11) then just move it where you want and stretch it to the max size. If you switch to full screen for the secondary display it will automatically go back to the left display. You can still use the main window in full screen with this modification.

Hope this helps
CHEERS

Still chasing around which doesn't make a bit of sense. Adobe, please resolve this!

Wow. Seems, this is a known problem.
Chasing around is not a solution.

Please let us choose on wchich screen #Number it will be displayed.

When working on multiple screens,
it should be possible to assign the second screen view
to a specific display.

I need to change the change/select the Display on which the second Window of Lightroom appears in my setup with three Monitors. There ́s no option in Lightroom for that.