The Filter button of the Document panel (Capture tab) hides the documents and pages that do not meet a condition, so you can review or process only part of the batch. The Indexing tab has a shorter version of the same menu. A filter stays active until you choose View all documents.
Option
What it shows
View all documents
Removes all filters.
Validated documents
Only the documents validated by the system.
Ignored documents / Documents not ignored
Documents marked as ignored, or the others.
Docs. with errors
Only the documents that have some error.
Find records with duplicate field values
Documents with the same value in the field you choose, for example to find duplicated invoices.
Pages SIMILAR to selected one
Pages that physically look like the selected one; used to group documents and assign them a type.
Search by file size / Filter by image size
Pages by file size, or by image size in pixels or millimetres.
Filter by page range
A range of pages.
Filter by bookmarks
Pages with a given bookmark.
Filtered by duplex scanning
Front or back pages of a duplex scan.
Show only documents without a type / with type / selected type
By document type assignment.
View only pages with OCR error status
Pages whose OCR failed, to redo them or mark them as reviewed.
View only ignored pages / NOT ignored pages
Page level ignore marks.
The thumbnails footer shows how many pages are visible out of the total. Actions such as select all, delete selected or process selected work on the visible documents only. The same filters are available to scripts with ChronoApp.Indexer_FilterDocuments.