At MetaMask we want you to have full autonomy of your user data, and whether you wish to participate in it being collected. If you no longer want to enable user data metrics or want to delete your user data, follow the steps below.
For more information on what user data is collected, see our article here.
Tap the pinwheel icon at the bottom right of the screen to access the settings menu and tap "Security & Privacy":
Scroll down the menu and tap "Delete MetaMetrics data". You may also opt out of participating in MetaMetrics if you do not want your data to be collected. You can do this by tapping the switch icon.