Searching for a user is supported in different ways:
The search bar on the top of the screen
You can enter any customer name or email in the search bar. As a result, the customer record will appear in the return overview.
Customer search in the right-side widget panel
The widget panel can be opened with the widget button in the top of the screen. In the widget panel, a customer widget will appear that allows you to search for a customer. As a result, the customer details will appear including a list of the most recent returns. You can click a return and as a result, the return details will appear.