How to delete an account?

I have been using K-9 Mail for several years to manage emails from several mailboxes.
There is one that I don’t use at all anymore and I would like to delete this account in K-9 Mail but I couldn’t find where to delete it neither in the list of accounts nor in the settings. You can add but not remove.
Who could tell me how to do it?

  1. Settings
  2. Choose the account with a single tap
  3. You’ll see the account settings
  4. from the … top right, Remove Account

Thank you very much.
Given the time, have nice holidays.