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SOLUTION (well, an effortless permanent workaround)
tl;dr: Found a script to easily automate moving and maximizing the secondary window.
After searching the internet for the seventh time, I'm finally happy with the solution I found. It's ten minutes work to install everything, and then you're set forever. (for the solution skip first two points)
Firstly: changing the display order by switching the adapters has no effect. Don't bother. (LR always picks the monitor the most to the top-left or bottom left).
Secondly: The quick but ugly way. In windows display settings, set the location of the screen to the right of your primary monitor and the screen where you want your Secondary LR monitor to the left of it. This should make LR chose the right one. Although, as this probably doesn't reflect your real set-up (as was the case with me) so after ten minutes you'll probably get so fed up that you'll revert the settings. 
(This is usefull for set-ups with projectors though)
Finally; the SOLUTION:
- Download and install AutoHotkey (Just install, there's no settings)
- Download this script made by one Geobert Quach: move_LR.ahk · GitHub
- Edit the script on the line with the WinMove instruction (don't worry, it's not rocket science) to set the right coordinates for the screen you want to use.
(To find the coordinates, use the "AU3_Spy.exe" program you'll find in the AutoHotkey install folder) - Also note that if your version of Lightroom is in a different language than english, you'll have to change the words "Secondary monitor" in the WinWait line to whatever the title of the secondary monitor window is.
- Save the script file wherever you want, and make a shortkey to it in Startup folder so it starts up with Windows.
C:\Users\<User>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ - You might have to restart LR or your whole PC for it to start work but now the Secondary Monitor should automatically appear in a maximized window on the screen you defined!
- To make it cleaner, you can find and download the app "Borderless Gaming" to make this secondary window appear as fullscreen instead of in a maximized window with title bar.
I hope this helps you out too!
ps: please note that I take no credit for any of the provided apps, scripts or solutions. I just found them, put them together and thought it was worth sharing here...
Similar to what Mediapix posted, this setup worked for me. I set monitor #3 as my main display (select monitor #3 and check the box under the "Multiple Displays" section to "make this my main display"). Then drag monitor #1 below monitor #2. Now the primary Lightroom window is displayed on monitor #3 and the secondary LR window is displayed on monitor #2. The only catch, and it's a very tiny catch, is that to get to monitor #1, you'll move your mouse DOWN to monitor #1 instead of directly to the right, from monitor #2, just as shown in the diagram below, because your monitors are no longer configured in a straight line. Hope this helps.
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