@MarioC it may depend on the version (and flavor) Android you’re running. On my Samsung Android 11 the screen does scroll.
I’ll also note that you can get to the notifications screen at least two different ways, and maybe (?) it looks different on your device. I also found at least one “dead end” that seems right but DOESN’T get me to the sound options, so maybe you went down that blind path like I did.
Here’s one way that worked for me just now:
From within K-9
-
Hamburger menu → Settings
-
[account name]
(touch any account name in the list) -
Notifications
-
Notification Settings
Open system notification settings -
[account name]
Messages
(under the account name you want to edit, touch the word “Messages,” NOT the toggle switch) -
Sound
(Brings up a list of available sounds, which will look completely different in different releases and flavors of Android)
EDIT: I removed that accidental blind path in my directions! My apologies if you followed it.