Hi Emmanuel,
Greetings from Syncfusion support.
Based on your query, we would like to inform you that while using OdataV4Adaptor, The response returned from OData service must be in the below format from which the count and data is assigned to the Grid to bind data.
So, we suggested to return the response object in the above mentioned format to bind the data properly in your Grid application while using OdataV4Adaptor.