In the Deatailed expense report screen, use the drop down under Filter by, to select the required filter. You get the following options:
Date of approval
Employee name
Department
Legal entity
Status
Payroll Start Date
Payroll End Date
Payroll Pay Date
Once you have selected the filter type, select the required options under Equals.
(Optional) - If you want, you can add more filters by selecting + Add new filter. Select the required filter and select the appropriate option under Equals.