Hi guys,
I was wondering if this is an Ignition issue or Java issue, when you are using 2 monitors and have client open in your second monitor and use a dropdown or calendar dropdown it opens up in the main monitor, its kinda annoying. I just didn’t know if its Ignition or Java.
cheers! 
As a workaround, you could most likely write a script to find out the current desktop monitor it’s using and making sure it opens on that.
Take a look at https://docs.inductiveautomation.com/display/DOC79/system.gui.getCurrentDesktop
and https://docs.inductiveautomation.com/display/DOC79/system.gui.desktop - I imagine these will help
AFAIK, this only happened if your screen configuration changed while the Ignition client or designer was open. Restarting the client or designer usually fixes the issue.
Though it’s a bit annoying indeed as it doesn’t only happen on dropdowns in Ignition windows, but also for all menu’s and dropdowns in the designer interface.