I tested several extensions of "Reader View" category, and any of the tested plugins renders Dictionariez incapable of recognizing the selected text.
readline https://microsoftedge.microsoft.com/addons/detail/readline/lgooahonadmfehgfgjdeffmhfndpklpa
reader-view https://microsoftedge.microsoft.com/addons/detail/reader-view/lpmbefndcmjoaepdpgmoonafikcalmnf
easyview-reader-view https://microsoftedge.microsoft.com/addons/detail/easyview-reader-view/nliopidpecelaedknfeanmkanoabfahi

All tested plugins, obviously, rely on a same shared component.

They include identical toolbar and notifications.
40ade513-5347-40de-b1a7-d333d5d9430b-image.png

Is there some setting I should change?

open https://www.quora.com/What-does-the-phrase-got-it-in-the-bag-mean select "got it in the bag" in the first sentence invoke Dictionariez besides Urban Dictionary no other default dictionary includes "got it in the bag" check out your history - no "got it in the bag" in the history.

WHY?