Hi Jesus,
Thank you for contacting Syncfusion support.
Based on the provided information we suspect that your requirement is disable the default Schedule Appointment editor in WPF, which can be achieved cancelling the AppointmentEditorOpening event of SfSchedule. Please refer the below to knowledge base to hide default appointment editor as the customized one,
If the given solution doesn’t meet your requirement, please revert to us with more details about your query we will check on it and provide you the solution.
Regards,
Subburaj Pandian V