Lockrz only works with the standard Android 6 “Nexus Imprint” system.
If the icon disappears when you touch the sensor to log in, you may have changed your settings. i.e this happens if you add or remove a fingerprint to the system.
If it is happening every time and you have not made such changes, please completely clear your app data:
Now you can import your data again from Dropbox or Google Drive and try again.
Do not uninstall then reinstall the app instead of clearing the app data. This could cause Play Store to restore your previous data which is what we are actually trying to remove.
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