Please, delete this if any doubt, just is that reproducably I have no clue how to NOT use the scrollbar to get to the latest mail, when changing back to INBOX. any way I sort for "date" it will fall back to the second oldest,when changing back to INBOX. otherwise great app. my first manual bugreport.
There are options for that. Go to /Configuration/Preferences/Display/Summaries Click the button 'Set message selection when entering a folder', and choose and/or rearrange what you want from the available choices. Please use either users' mailing list or the IRC channel for help in future. https://www.claws-mail.org/MLs.php