We have the following set in App Config in Outlook.
<dict>
<key>com.microsoft.outlook.Mail.FocusedInbox</key>
<false/>
<key>com.microsoft.outlook.Mail.OrganizeByThreadEnabled</key>
<false/>
<key>com.microsoft.outlook.Contacts.LocalSyncEnabled</key>
<true/>
</dict>
We have confirmed the below works
<key>com.microsoft.outlook.Mail.FocusedInbox</key>
<false/>
but the below settings don't work
<key>com.microsoft.outlook.Mail.OrganizeByThreadEnabled</key>
<false/>
<key>com.microsoft.outlook.Contacts.LocalSyncEnabled</key>
<true/>