This has come up enough times, apparently people out there are using 3 displays while DMing. Seems overkill to me, but to each their own.
I lacked the hardware necessary to test more than 2 displays on. Didn't occur to me until today that I could just install a virtual display adapter to simulate the extra display.
So now on the very first screen that comes up, if you have 3 or more displays plugged in, there will be an option at the bottom to manually set the display you want the DM and player views to appear on.
If you have 2 or less displays, nothing should change.
I can't promise that it will remember correctly if you go swapping ports or powering off devices in between sessions. So you might have to manually adjust it each time. It also is ONLY present on the first calibration screen and ONLY if you have more than 2 displays plugged in and powered on.
I haven't tested it on Mac or Linux either. I probably won't bother as that is a lot more work and I have no idea how many Mac or Linux users there are using this thing with 3 or more monitors. But if it comes up there is a problem, I will look into it. Just let me know.
Along those same lines, I got a bad review today. About this very issue, actually. It was in Russian and I assume they did not bother to check the forums to see that this was a known problem and a fix was being worked on.
At first I was going to region lock this to North America only. It's free software I spend my own time making and seeing negative reviews for something like that ticks me off. I made this software to sell wooden cases with TVs/touchscreens inside them and I only ship to North America. It doesn't do me any good if people outside North America use this software.
But I WANT people to enjoy it anywhere and everywhere. So I decided not to region lock it for now. I noticed half (2/4) of the negative reviews I ever got were in Russian and it seemed like blocking Russia was an easy fix for that.
Sorry, just venting. Please go leave a positive review so I can quit complaining and focus on making the software better and keep it widely available. Thanks!