Once additional fields have been added, they can be searched as 'is' or 'is not' operators beneath the built-in search options.
In the above example, I've added non-public notes and damaged statuses as additional search fields. Because I connected the damaged field with an authorized value, that search field has a drop-down menu to select a damaged status, but the non-public notes field has no connected value, leaving it a free-text field.
These are two common fields that partners ask to be able to search in item search, just looking at item holding data, but the search can query for items on records with any MARC field like a 650$a subject heading or a local 5xx note field, giving libraries a great way to customize a powerful tool.
Item Search Categories
An item search category allows libraries to group together multiple item types into one "Search Category". This means when a user is on the OPAC and wants to look for a specific title in Books, having a Search Category set up for Books, can include Large Print, Lucky Day Books, Paperback, and Hardcover. These are all the different item types the library has set up to uniquely identify the format or define the circulation rule.
Setup
For a library to set up a search category, the first step will be to create the search categories within the Authorized Value section of the Administration Module.
The Authorized Value category is called, ITEMTYPECAT. Here a library will want to create their over-arching Item Type Search Categories.
Once a library has created these values in the Authorized Values, they then can allocate those Search Categories within the Item Types. In the Item Type setup, there is an option to attach an item type to this newly created Authorized Value:
Now for the user, when they search and limit by Item Type "Book" in the OPACand Koha will return all the item types linked to the Search Category.
Sort and Search Within Results
From the search results, we can select any column to sort by that field.
Selecting the column again reverse sorts it. The small blue triangle indicates how the results are sorted.
In addition to sorting, we can also search within the results by typing in the box just below the column heading. In this example, I’m looking for any items from Candlewick Press.
Batch Item Operations
Links for batch item operations appear at the top of your Item Search results table when any items are selected. We are big fans of saving clicks and simplifying workflows!
With the ability to mark items returned from Batch item modification (bug 32019), it’s easier than ever to identify your items that have been lost, retain any replacement fees charged on patron accounts while removing the items from their checkouts, and then deleting them - all from Item Search!

Only staff with batch item permissions will see these options (items_batchdel and items_batchmod).
Staff have the ability to share an Item Search with a link. A 'Copy shareable link' button to item search results is located above the search results in the staff interface.
Click on Columns to make a temporary change to the item search results table. Click on Configure to permanently hide columns. Table configurations are also available from Administrations.