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I have also problems with version Version
4.0.1. Although i have choiced "Use top-level inbox when Unified Folders view is activated." and "the latest unread message.**" these function doesn't work. The latest unread message will not be focused.

Questa recensione riguarda una versione precedente (4.0.1) del componente aggiuntivo. 

Can you please contact me via k-l-p@gmx.de in order to start a troubleshooting process?
Best Regards
C-E

16.11.2023
Do the problems persist in Thunderbird 115.4.3?

Update 04.12.2023:
Do the problem still exist if you use version 4.2.3 of the Add-on?