Change the new double-line-spacing in Thunderbird 102.6.1 Local Folders and Message panes to single-line-spacing as it has been in the past.
Somehow the option for line-spacing has changed itself in this most recent 102.6.1 "update". The Messages listing display format in the Inbox (and all other folders) was like this until recently:
Local Folders
Inbox Message 1 Message 2 Message 3 Message 4
Message spacing now:
Local Folders
Inbox Message 1
Message 2
Message 3
Message 4
Help! Thanks to anyone who could suggest a solution.
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The answer is in this post: https://support.mozilla.org/en-US/questions/1372595
Matt Top 10 Contributor, Moderator, 3/30/22, 6:14 PM
Line spacing is the paragraph Vs body text option in Preferences. (search body in preferences and turn off paragraph format instead of body text.