The Single View function integrates grades directly into the Grader Report, and any grades inputted via this page are categorized as "Overridden," indicating that modifications cannot be made from the Assignment or Activity-specific grading interface.

To access Single View:

• A pencil icon at the top of each column in the Grader Report, next to the activity name, provides access to the Single View page for that activity. 

Entering Grades:

• Upon entering the page, activate the Override checkbox next to the grade you wish to modify. For bulk entry, selecting "All" at the top of the column allows simultaneous modification of all grades.

• After making changes, click on Save to update the grades accordingly.
  

Reference: https://docs.moodle.org/403/en/Grading_quick_guide