How can a line manager mark a learner as complete for a course?

Summary: We've allowed line managers to mark learners as complete in our course settings, but we can't find where managers can check them off in the system. Is this feature available and if so where?

Content (required): See screenshot for image of the settings we've ticked.

Version (include the version you are using, if applicable): 23C

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