Hi Gergia,
currently it is not possible to disable the email notification when you submit an order from the back office.
It is always good to send email notification to customers as a confirmation that you have made the booking.
However, if it is very important to your business model to disable email notifications when submitting orders through back office then we can add an option in New order screen: Send email to Customer: Yes/No where you can select No if you don't want an email to be sent out.
Would that work for you?
Please let us know.
Kind regards.
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