Shaking facetracker & excess "play" button

Hello! I’m starting to develop some simple projects and ran into a number of problems:

  • when i use facetracker, images around the face are shaking and shiver, how to fix this problem?
  • sometimes when i run my published effect i need to press round play button after the button “Launch” in Zap interface. How to remove this play button from my projects?