This new release contains powerful new features to enhance the discoverability of your community and the content within it. With Discourse Discover, members can easily find and join your community, even when on-the-go by using the Discourse Hub mobile app. Additionally, the new Hot topic list surfaces trending topics so your members can keep up with the most popular conversations in your community.
Is the admin sidebar enabled at your site (admin sidebar enabled groups)?
Then you can find “moderation flags” in the community section of the sidebar.
You can also access {YOURSITE}/admin/config/flags directly