All custom dictionaries are identified and placed in the dropdown. However, only the one actually selected should be used. Now, if there are multiple custom dictionaries in the Word settings are selected, I *think* they will be used as well. It depends on how the function is programmed. I will look into a possibilities to find all the selected custom dictionaries, unselect them and at exit of the spelling procedure restore old setting.
If you choose 'add to dictionary', it will add to the selected custom dictionary in the dropbox, so the one you see.
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