...
Navigate to the Gradebook.
Switch to the traditional Grades view in the top left corner.
In the top right corner, click on Fliter.
A side panel will pop up with the following view:
Types of Filters
Students: Search by first/last name
Groups: Search by student groups.
Gradable Items: Search for any item in your Gradebook that is gradable.
Categories: Search by all default categories and categories you have made.
Child Sections (conditional): If your course is a parent section with child courses, you will be able to filter by the child course ID.
...