Two Questions About Screen Settings

1. Yes, with Kernel object or WinMesPro

2. I guess Multiple Monitor Support object..?

I know you can do it with those objects cause I've did this many times.
But, this may have changed because of the new UI library, I'll check later...

I alternatively can add this toggle to my HiddenProperties (WIP) extension.

And as far as I know, going fullscreen already picks the monitor that has the majority of the window.

Although, since you're using UFS, I'm not sure if that does it...
I've actually made a fork of UFS and made fixes, most of which are related to multiple monitors, you can check it here:
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Can you send a example? Because here it always go to the correct monitor...

Frame event, lines 20 to 24, you're centering the window through a expression, there's nothing there that relates to the monitor your using.
So it would pick the center of the primary monitor since going to the left/up of it would have a negative position.
You're also using the wrong expression for window position.

But, I also noticed a bug on Set Position (the one that has different modes to choose) of Window Control object, seems like it isn't doing the right equation.
Fortunately there is a workaround with Multiple Monitor Support object.

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Edited mfa (link will probably not last forever but the file is a bit big for the forum):
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Well, here's a quick and dirty example (uses 2.5+ and dev extension btw...)

Tried adding to my HiddenProperties extension, doesn't seem like those flags are meant to be changed during runtime.

When I toggle Heading, nothing happens.
When I toggle Heading when maximized, It eliminates the heading but you can't add it back.

So I guess a extension would need to do what I just did with events, store the heading size, remove it and resize window, then add it back and resize the window...