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If 'use external dictionary' is NOT selected, it definitely should open the dictionary viewer when you press Dictionary in the pop-up. Even if no dictionaries are installed or selected, the window should still open but with a notice that no dictionaries are available. So I'm a bit baffled as to what your issue might be.
Does it work by chance if you have 'Dictionary on single word selection' enabled? The setting is in the top menu, Settings (gear), Taps and gestures >, Long-press on text >.
Then just long-press on any word in the book and the dictionary should open.
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