Hi Jean,
Thank you for contacting Syncfusion Support.
We were unable to reproduce the reported issue "SfDateTimeCombo control disappear when IsEnabled is false". We have attached the sample and screenshot which we have tried to reproduce the issue. You can download the sample from the attachment.
If the issue still exists in your side, please update us the issue reproducible sample,screenshot and Syncfusion version details. This would help us to proceed further.
Regards,
Durga S.
Attachment:
SfDateTimeCombo_e5ae6982.zip