Opportunity Subview under account doesn't let us search for record suing Sales Stage

Summary:

Under Oracle CX Sales Cloud Redwood version Account Page we have Opportunity Subview. Since Account has a lot of opportunities, we're trying to search Opportunities using Sales Stage but it doesn't show Sales Stage in search menu.

Ideally, if field is added to the Subview then it should allow end users to apply filter based on that. FYI, this is standard Sales Stage field and we have enabled this attribute in Adaptive Search.

Question - Why Sales Stage filter option is not available to filter Opportunities records under Opportunity Subview.