To access your Account's Advanced Settings, follow these steps:
- Open Settings.
- Go to Account Settings.
- Select the account you wish to manage.
- Tap or click on Advanced.
This screen now only holds CalDAV settings for the account — see Configuring CalDAV.
Most options that used to live here have moved: Always BCC, Always Show CC/BCC in Compose, Enable Read Receipt, and Mark as Read when Opened are now direct toggles in Account Settings (see Edit Account for the full list).