This is an example – you can add code like this to the form data source to run when initialzied.
[DataSource]
class CustomDataManagementIntegrationLog
{
/// <summary>
/// Pre-sort form data source
/// </summary>
public void init()
{
super();
this.queryBuildDataSource().addSortField(fieldNum(CustomDataManagementIntegrationLog, CreatedDateTime), SortOrder::Descending);
}
}