SfListView allows you to maintain only one group in expanded state by handling the event. If any group is expanded, then collapse the remaining groups by comparing with expanded group. Please refer the below code snippet.
In this above code snippet, the first group is in expanded state, which is maintain by expandedGroup field and remaining groups are collapsed when SfListView is loaded. If any other group is expanded, based on comparing the expandedGroup field, remaining groups gets collapsed.
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