To opt out of receiving Friend Requests in Android:
1. Select the Profile icon
2. Select the Smaller Profile icon
3. Select Edit Profile and Privacy
4. Scroll down
5. Select 'Allow friend requests' to 'No'
6. Save
To opt out of receiving Friend Requests in iOS:
1. Select the Profile icon on the bottom right
2. Select the gear icon in the top right
3. Edit Privacy & Messaging
4. Select 'Friend Requests' to 'No One'