WPO 2021 Oxford Dictionary ref in Spell Check

I use WPO 2021.  WP Help states: “Now standard in WordPerfect Office 2021, the Oxford Concise Dictionary.”  If I go Tools/Dictionary and enter ‘contralateral’ as a word then the dictionary successfully finds it with the correct definition.  But, if I use the word in a document, then Spell Check flags it as a misspell. Does Spell Check not use the Oxford Dictionary as the new .mor file, i.e., dictionary ref for spell check?