• You should add the report to Explore.
• You should add the report to Library.
• You should add the report to Admin.
• You should add the report to Collection.

The correct answer is: You should add the report to the Collection

Explanation: Ensuring a Customized Report Appears in the Left-Hand Navigation. After customizing a report in Google Analytics 4, to have it appear in the left-hand navigation, you need to add it to a Collection. Collections are organizational units that categorize reports, making them accessible from the main navigation panel. By assigning your customized report to a Collection, you integrate it into the navigation structure for efficient access.

Read more here: https://www.optizent.com/blog/google-analytics-4-navigation-and-customization/