I have the same problem.
Found this bug report for Fedora:
https://bugzilla.redhat.com/show_bug.cgi?id=1422626
The Workaround also works for me:
1. Load Kmail
2. Hit "Settings->KMail"
3. Press OK (no need to change anything, just hit OK)
- After this the settings appear to reload.
reg
Package: kmail
Version: 4:16.04.3-1
Severity: normal
--- Please enter the report below this line. ---
Dear maintainers,
Selection of the headers format (fancy, enterprise, standard…) is not
remembered between restart. Reset to the "Kmail 5.2" format on each start.
Regards,
--- System informat
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