email thread lines

[Rob Pyott]

Hello, I recently set up neomutt with Gmail.  My .muttrc is quite simple (below).  I cannot see email threads though.  How does one turn on this feature?  Thankyou!  Rob 

set from = "arpyott at gmail.com"
set realname = "Rob"

# IMAP settings
set imap_user = "arpyott at gmail.com"
set imap_pass = xxxxx


set sendmail = "/usr/local/bin/msmtp -a gmail"

set folder = "imaps://imap.gmail.com:993"
set spoolfile = "+INBOX"
set postponed = "+[Gmail]/Drafts"
# set record = "+[Gmail]/Sent"
# set trash = "+[Gmail]/Trash"
set header_cache = "/Users/albertpyott/.mutt/cache/headers"
set message_cachedir = "/Users/albertpyott/.mutt/cache/bodies"

set mbox_type = Maildir