Hi Barry,
Greetings from Syncfusion support..!
We have validated your requirement and suspect that you need a field in editor window to add the notes. We let you know that, by default in scheduler editor window there is a field called “Description” for this type of requirement and you can also add your custom fields in editor window using editorTemplate. Please find samples and more information about editor window from following documentation links.
Description image(default):
Kindly try the above solution and if misunderstood your requirement, please share a detail use case scenario and requirement screenshots to provide the prompt solution at earliest.
Regards,
Praveenkumar