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Ah ok, that compatibility option in DisplayFusion is for hiding the titlebar buttons that DisplayFusion adds to the titlebar, not for removing the titlebar itself.
There is a scripted function you can download that should do what you're looking for though. On the Settings > Functions tab, click Scripted Function > Download Scripted Function, and download the one called "Toggle Borders and Caption From Window." You can set a key combination on it, and then run that on the window to get rid of the titlebar.
Hope that helps!