How can the class teacher view the notices awarded to students in their class?

If the class teacher does not teach his class, he / she can see the notes / praise through the advanced mode.
Click on the grades and on the course selection again.

The Advanced mode icon displays in the bottom part of your screen. Click on the icon.

In the "Grades" tab, switch the view from "Grades' to "Notices/Letters".

Here the class teacher can see the notices of the students of his class.