Hi _Ruud,
Welcome to post in our forum.
Based on my research, there is no method to disable smart contact in SFB online.
For this issue, because our forum is mainly about SFB on premise, so we suggest you post in SFB online forum, there are more experts will help you with this issue.
http://answers.microsoft.com/en-us/msoffice
Regards,
Alice Wang
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