How to see timesheet approval data by permission scope

Hi, I want to use the Timesheet feature in my organization. We have defined multiple support groups. Each support group can only view their own requests. We want to give the group leader to access approve the timesheet. Unfortunately, I find out everyone that access to timesheet approval can see all work logs and timesheets that not in their own group. How can a group leader be restricted to seeing only his or her group requests? I attached support group member and leader to clear my need. SDP MSP v10.5.20 DB: PostgreSQL Thanks for helping