There is a field "Filter condition" that you can use to filter records using the OData $filter syntax seen below. Click on the hyperlink in the field hint for additional information about the query syntax.
If you do not see the field, look for it under Add/remove optional fields.
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Saul Macht
How to search records by date filter in MS Dynamics CRM?
Is there anyway I can filter the data based on Date in Scheduled Search Trigger in MS Dynamics CRM?