People results not showing in dropdown (predictive results)

When a user begins typing in the search box, from the Hub home, the predictive results that are immediately shown as a dropdown below don't show People results... just files and sites (see attached). Yet, it does show this on the Microsoft Search Center home form the Office 365 home. Can someone tell me how we can turn this on so People results do show from a Hub or SharePoint home?

Thanks in advance.