You can select a specific user from the Users list in the Approvals tab and then approve their time details.
To approve the time details of a specific user
- Go to the Approvals sub-tab in the "My Review" tab
- Click the user dropdown and select the user from the list and click the apply button
- You see the time details only the user that you selected for approving time
Note: You can select a specific date range from the From and To calendar.