Custom Forms for Contacts will ultimately replace classic Contact Forms
Get Started with Custom Forms
The Manage
...
...
page gives you access to the two types of Custom Form:
Case Forms (also called Custom Forms for Cases)
For Contacts
Create Turn on Custom Forms for CasesContactsEdit
Manage your Custom Forms
Access the Custom Forms page from the Control Panel
...
On the Custom Forms page
https://www.makerble.com/charities/makerble-ppj/custom_field_categories
...