Kontact and Kmail settings out of sync

I am having some problems using Kmail and Kontact together. A while back I used kmail standalone. Now I would like to use Kontact. I am seeing a number of difference between the kmail settings that I can access through the ‘configure Kontact’ option and what I can access in the ‘configure Kmail’ option (both available within kontact). Moreover, there are also difference in settings that I can see in kmail when it is run as a standalone app.

For instance I can only set some shortcut keys, and message tags, in kmail settings not the kontact-kmail settings. Same with templates; editing one of the standard templates in ‘configure kontact’ has no effect, but does if set using the ‘configure kmail’.

Also if I try to enable using an external editor my composer windows look like this:

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I am guessing that it might have something to do with inconsistent settings between kontact-kmail and kmail.

Could anyone tell me how I can make the settings between kmail and kontact consistent?

I have tried deleting various *rc file in ~/.config but it did not resolve the problem. I know there are different places where kmail stores some settings and where kontact does, but (I assume) they should be syncing, and they are not.

Operating System: openSUSE Tumbleweed-Slowroll 20251002
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.17.1-1.0.4.sr20251001-default (64-bit)
Graphics Platform: Wayland

Kontact: Version 6.5.1 (25.08.1)

Kmail: Version 6.5.1 (25.08.1)