My games were all opening on an undesired monitor and could not find a solution so I ended up switching my default monitor.
However, from there now the games open up on the right monitor but the other monitor gets the startup screen which I need to click or the monitor will be blacked out.
Happens in both launchbox and big box, with multiple emulators. One of the monitors is 21:9 if that makes a difference.
Any Ideas?