Primary Contact field not visible on Manager Person Screen

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Hi Team,

when we try to Edit Contact or Create New Contact using the Classic page (My Client Groups > Person Management > Manage Person > Contacts -> Pop up window is displayed) the field "Primary contact" is not visible.

I have tried to use page composer to find the field and enable it, but I could not find the "pop up" window to apply the configuration.

Could someone tell me the steps to enable this field? screenshot attached.

thanks,

Vivi