not sure about custom UI, but youc an prevent this on default UI by clicking thier F number (F1, F2, F3 etc) before you click disband. Even if not in zone, and even if it doesnt click them in your target window, it should work.
Hopefully this works on your current UI
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Fifield - 60 Bard <Aftermath>
Syllus - 60 War <Blood Guard>
Fifeheals - 60 Cleric <Kittens>
Oralen - 60 Ranger <Core>
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