Removing a source from a similarity report will 'recalculate' the similarity index without consideration to the removed source in question. This feature is useful when a paper has been submitted to Turnitin multiple times, and the originality report is reporting a high match (eg 100%) to the previous submission. Removing a source from a similarity report provides a clearer similarity index (percentage).
Open the assignment and click on the View all submissions button
Click on the percentage to load the Turnitin Feedback Studio document viewer
By default the Filter and Settings will load
Click the graph icon to load All sources
Scroll down to the bottom of the page and click the Exclude sources button
Select the sources you wish to exclude
Click on the Exclude button to save your changes.
Your report will then recalculate (excluding the sources you selected).