Auto-sync and background sync

On v.5.806, Graphene, i am trying to have k-9 mail sync email in the background. There is an option in General Settings/Network that offers three background sync options: Always, When auto-sync is checked, Never. I am hopeful one of my three accounts (only) can be checked automatically… but where shall i find the auto-sync checkbox(es)? Ty - jet

The background sync setting is to disable all of K-9 Mail’s background sync activities under certain conditions.

To configure individual accounts go to Settings → [Account] →Fetching mail. To disable automatically checking an account set Folder poll frequency to Never and Push folders to None.

Thank you for the help. It works just like you said it would.