Hi Tommy,
Thank you for using Syncfusion Products.
We would like to let you know that the SfListView has inbuilt feature for expand and collapse the grouped items and it is not an expandable ListView. If your requirement is to expand and collapse the groups at runtime, we have prepared the sample as per your requirement “Expand and Collapse the groups in SfListView” and you can download the sample from the below link.
Could you please check with the above sample, if your requirement still does not meet, please revert us with additional information’s which will help us to provide an appropriate solution to you.
Regards,
Dinesh Babu Yadav