I open RealVNC client window in fullscreenmode on my secondary display.
seems that the panel DF disappeared - good.
But when I open document in WinWord and press middle button, it's windows doesn't move application to next monitor - not good.

What it is? Expected behavior?

I'm not exactly sure what you expect to happend when you press scroll+click.

Default windows functionality is "open a new instance of whatever you're clicking".

Or did you mean clicking the titlebar?

Remember that you can customize every hotkey in under the settings menu, you can also customize titlebar buttons.

If you explain the problem with a little more dept it'll be easier to help out

I click middle button of a mouse. And I think that some code, which is work when DF detected full screen application, is not work actually.

I expect that WinWord moves to next monitor. It always work when it's no full screen application opened.

Yeah! Now it's much better for me.
Thank you for responsiveness.