In the Global search, you can use any term to search for invoices.

In the black menu on the right, click Search and then the Global search tab

Here you can, for example, search for a name or part of a name and then get all the invoices that have that name in the reference field, on a coding row, as sender or as a approval signature.

If you want to filter the search results, you can, via the check boxes, choose what you want to search among.
Via the Coding option it is also possible to search for messages on coding rows.
You can also, via the drop-down list, choose whether to view all invoices, only those that are active or only those that are archived