schedule send option missing in outlook

It's still there, moved. In new Outlook click the little arrow on the Send button itself, Schedule send is in that dropdown, or press ctrl+shift+enter in the message. If the arrow isn't showing at all, widen the compose window, it hides on narrow panes. One thing I've noticed: it only appears for Microsoft accounts, a Hotmail or Outlook address or a work 365 mailbox. A Gmail or IMAP account added to new Outlook doesn't get it as far as I've seen.