To update new supplier settings, please just refresh supplier list from Xero in the 'Supplier Automation' dashboard.
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1. Open 'Supplier Automation' dashboard

​2. Click 'Refresh supplier list'

Update June 2021:

Datamolino now tries to automatically update the list of your Xero contacts in Supplier Automation when you add or archive a new contact directly in Xero. This should be accomplished within up to 30 seconds and cover most of the scenarios. On same rare occasions, if you encounter a syncing problem, just manually initiate the refresh by clicking the button on the above screenshot.

Please remember, instead of adding new contacts in Xero, you can always add it directly in Datamolino along with all important details. Just click 'Add new contact' option.