A Hand in the center of the picture ， what's it mean？
what should i do ？
Thank you for your message.
This symbol invites you to move slowly around with your camera so the software can detect the environment around you (distance between objects etc...).
To have an optimized environment detection, I recommend you to make slowly little rotation around you until this hand disappears.
I hope this could help. If not, do not hesitate to ask your questions here.