To toggle Location Sharing on or off, please follow these steps:

1. Tap the 'Single-person' icon at the bottom of your screen.
2. Tap the 'Profile' tab and tap the 'Gear' icon at the upper right.
3. Locate the 'Share Location' option and tap on the toggle to turn it on or off.

Please note that if your Location is toggled off, you will not be able to see Leaderboards rankings based on your location.