Open Settings
Tap your name at the top
Tap Find My
Tap Find My iPhone
Turn off Find My iPhone
Enter your Apple ID password if prompted
Go back to Settings
Tap Privacy & Security
Tap Location Services
Turn off Location Services to stop all location sharing
To stop sharing with specific people, open Find My
Tap People
Select the person
Tap Stop Sharing My Location
To stop sharing in Messages, open the conversation
Tap the contact name at the top
Tap Stop Sharing My Location
To stop sharing in Family Sharing, open Settings
Tap your name
Tap Family Sharing
Review location sharing settings and disable as needed