Mozilla ThunderBird, for some years ago was big mistake, that they changed the different layout for users and lot of troubles to users = clients.
Mozilla was NOT respecting THE USERs !
Same thing with @gmail.com.
Now I have Browser and E-mail in the same Vivaldi.net and my own Vivaldi E-Mail.
Thunderbird users have multiple choices of layout listed at Getting Started with the Thunderbird main window (Supernova and newer) | Thunderbird Help
Thunderbird is developed by MZLA.
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