I only know the possibility of "record customization" in the property settings where you can customize the properties displayed on the records themselves. Unfortuantely I think there is no way to change the preview of a contact on the right sidebar of a company. But actually I think this would be a great feature request/idea!
I only know the possibility of "record customization" in the property settings where you can customize the properties displayed on the records themselves. Unfortuantely I think there is no way to change the preview of a contact on the right sidebar of a company. But actually I think this would be a great feature request/idea!