The export of invoices is based on the current display of invoices.
You must first set up the filters according to your needs and then export the selected documents.
Step by step
Click on the 'Finances' sidebar menu, then the 'Invoices' tab
Click on the 'Filters' button
Enable the desired filters: document type and status, clients, projects, phases, and periods
Click on the 'Export' button
You can also export your invoices and credit notes from the 'Invoices' tab of a project."