The app shows this leaderboard only if there are segment efforts today.

Hello ​@Gyoda - another possibility is that your account time zone is not set correctly. Could you please verify whether that is the issue?
 
Please try the following:
 

1. Access your account through the Strava Website
2. Go to Profile > Settings
3. Select your current location and type in Los Angeles & Save (this is to reset the time zone, we recognise this is not your accurate location. You will reset your location in step 5)
   
4. Select Refresh Page
5. Enter in your correct location & Save.
6. Select Refresh Page (if the time zone still does not refresh to match your location please try step 3 again and then refresh the page followed to ensure the time zone and location match. Then enter your correct location again and refresh the time zone). Sometimes the timezone gets stuck and just needs to get adjusted back and forth to reset itself. Once it is set and is accurate it will not revert back.

It seems to be working fine for me in the app.  As ​@Jan_Mantau stated, it will only be visible if there have been rides on it “today”.  If nobody has logged an activity on that segment yet, it will not show up in the list.