Currently, custom controls are supported on larger display versions (desktop/tablet) of POS views but not on mobile views. This creates an inconsistency in behavior between phone and tablet/desktop devices. Extensions targeting CustomerAddEditView do not apply to CustomerAddEditViewPhone because these are separate views with different schemas. As a result, critical custom fields required for customer creation and editing are unavailable on mobile devices.

Suggested approach is to enable support for custom controls on mobile POS views, similar to what is available for desktop/tablet views. This would allow extensions targeting CustomerAddEditView to also apply to CustomerAddEditViewPhone, ensuring consistent functionality across all device types.