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Did not work for me. I have Unified View set, but the individual inboxes still show under it, even after restarting Thunderbird (v. 102.9.1 64 bit).

Это отзыв для предыдущей версии этого дополнения (5.0.0). 

please make sure you selected unified view mode. if you look at end of list. you see that email folders disappears. look at screenshot of addon in this page to find differences:

https://addons.thunderbird.net/en-US/thunderbird/addon/hide-email-folders/