By default in Silver and Gold, autograder quiz scores will display in student accounts. In Starter, teachers need to grade student work first for students to see their scores.
If you would like to hide scores from students so they cannot see their own quiz scores, you can disable this in your Class Settings.
Click on the drop-down arrow in the top right of your account, then click Settings. Choose the Scoring tab on the left. Finally, click Show quiz scores to students:
Note: Students only see their own scores (they cannot view their classmates' scores).
Learn more about How Students Access Their Writing and Score Data.