Once you've customised a report, where does it need to be added to in order to appear in the left-hand navigation?

To make a customized report visible in the left-hand navigation of Google Analytics, it must be added to a Collection. Collections are curated sets of reports that appear in the navigation panel, allowing users to quickly access relevant data. The Library is where all reports (standard and custom) are stored, but they won't appear in the navigation until added to a Collection. Explore is a section for advanced analysis tools, not for organizing reports in the navigation. Admin is where you manage account, property, and view settings, not where you organize report navigation.