Subscribe by Email missing settings (from email, batch size)

The "from_email", "keep_logs_for" and "mails_batch_size" options are no longer accessible through the sbe options page (they were before).

I need to fix an incorrect "from address".

I disabled and enabled the plugin to no effect. I then disabled, deleted all wp_options for sbe, then enabled again. Still no effect.

Please advise on next step.

Thanks,
Peter