The count-based catalog displays the count of specimens along with their respective data. You can create the “Search query” to use aggregate counts to display specimen counts instead of the list of actual specimens in the Catalog. E.g., count specimens for each type, per patient, visit, etc.
...
item detials query is used to display the requested specimens to the request managers. This is also used in the CSV sent in the email notifications to the request managers and requestors (OpenSpecimen users only).
Having two different queries i.e search query and item details query allows you to configure different columns for the request managers vs. researchers.
Note: This query must include the 'Specimen > Identifier' column in the results view.
...