I have two monitors, a smaller 1280x1024 that is off to my left side and a 1920x1080 primary right in front of me. According to Windows Display settings the primary 1920x1080 has the "Make this my main display" is check marked. Yet when I type "Launcher" into Windows search box in my task bar, and click the Minecraft Launcher it absolutely insists on loading up onto the 1280x1024 display every * freaking * time! Then I got to grab it, drag it over to the correct display, click the 'box' button at the top right to resize it correctly, before I can launch Minecraft.