Reply button not displayed in landscape mode

I am an old user of K-9 mail and I am very pleased with the software.
No other app can compete with !
Nevertheless, I saw that when using landscape orientation (with smartphone or tablet), the reply button is not displayed at all.
Only next, previous message, trashcan and 3 dots button are displayed.
Is it a bug ?
Can you help ?

Best regards.

Press the three dots, then ‘Send…’, then ‘Reply’.

Yes of course ! Thanks for your help.
I didn’t think the Send button (Envoyer in french) can host a reply option… Sorry.
I will choose that way to reply in landscape mode.

But a reply button could find his place as there are plenty of space in the toolbar in landscape mode ?
Best regards