If you have references in your Project that you have determined to be outside of the scope of your review based on their date or year of publication, consider the following steps to remove them.
Go to Reports > Datarama and go to the Reference Display Options tab. Select the "Date" option in the Reference Fields panel. You will have to export the results as an Excel file - go to the Report Settings tab, and select Excel as your Report Format in the "Basic Options" panel. Click Run Report.
In the exported Excel file, sort your references by their Date. Copy the RefIDs of the references in the date range you'd like to remove from your Project.
Go to Datarama again, and in the Reference Criteria tab, paste the RefID list into the "RefID" text box. Click Run Report. The results will contain the list of references you intend to delete or quarantine. At the bottom of the report, you should see buttons with the options to either Quarantine those references, or Permanently Delete the references.