A Studium analysis does not allow you to view passages that are identical to web content. It provides a list of sources ranked by order of relevance and the percentage of similarities.
This is a deliberate decision by Compilatio. Studium is not designed to teach you how to cheat. The software is not intended to indicate similar passages so that you can rephrase them, thereby clumsily concealing where you've copied and pasted. Studium simply tells you the rate of similarities for your work and the list of external sources detected. This will allow you to double-check: Do the listed sources appear in your footnotes and in your bibliography? If you want to reduce the analysis score, you can check the most significant sources in the report to find similarities and make changes to your work.
For further information, check out the article "What are the differences between Studium, Magister and Copyright analysis results?".