More > Organization Settings > Display Preferences > Show Leaderboard
The leaderboard is visible to all users in your TeamBuyIn account. If you want to turn it on or off, go to the "More" tab in the toolbar, then click "Organization Settings." Under the Display Preferences section, you'll find the "Show Leaderboard" toggle. When the toggle is on, the leaderboard is visible to everyone. When it's off, it's hidden.
Note: This setting applies to your entire organization. Turning off the leaderboard hides it for all users, not just individual ones.