I have the '+' expand sign appearing under individuals who don't have anyone working under them. Please see the attached photo below. The Number of Visible tree level is set to 3. How do I remove the sign from these individuals who don't have anyone working under them? 
Hello Nayan! I reproduced the issue and informed developers about it. I will keep you posted about further updates.
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Great, thank you Evgeniy!
Hello! We released a new version of Org Chart for SharePoint Online. Please download the package here and upload it to your SharePoint app catalogue. Clear browser cache and check whether the issue persists.