Restrict visibility of Performance Documents to level 1 manager

Summary:

We would like to restrict the content of a performance document to the level 1 manager only.

Content (required):

Level 2, 3, 4 etc managers can view the performance documents for all staff that report into them by drilling down in the Performance Overview page. Our HR team would like to restrict their view to only see the completion status and performance rating. This is to ensure the document is confidential between the employee and their level 1 manager. Is this possible?

Version (include the version you are using, if applicable):

23B

Code Snippet (add any code snippets that support your topic, if applicable):