HR and team managers get an overview of all expense reports to validate from the top menu To Approve ‣ Expense Reports to Approve. Such users must have at least Officers access rights for Expenses.
They can review expense reports, approve or reject them, as well as providing feedback thanks to the integrated communication tool.
As a team manager you can easily find the expense reports of your team members. You need to be set as manager in the detail form of those employees.