Click on “Imported Guest Lists” under Manage > Import/sync.
This page shows the guests lists connected with a particular event in addition to showing when they were last synced.
You cannot “refresh” a .XLSX import. Instead, delete the current list and re-import your updated list. If you want to update your current guest list, you can do so via the barcode method.
To "refresh" the guest list after the integration, select the spinning arrows to the right of the specific event.