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It’s not difficult to make a “close dialogue” event. Its logic should find the dialogue widget (you need to save a reference to it when you open it) and call a “remove from parent” node on it.
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It’s a question of restoring focus to game after you quit the dialogue. Add these two nodes:
https://i.gyazo./b942b5bf1cc302e00009fe4fad8fc428.png