How to restrict technicians reflecting in Schedule "Work Order Screen" from other WO areas

Dear Experts,

Need your advice on how to apply restriction for technicians showing in "Work Order Schedule Screen" based on the selected WO Area.

Scenario: We have two Work Order Areas mapped to same work zone.

WO Area-1 has one technician, WO Area-2 has twelve technicians

During WO creation, though the appropriate work order area is selected, "Schedule Work Order" screen showing all 13 technicians from the two areas whereas expected is only one technician for the selected area.

Thank you!