How Can I close a part of position?
If you do NOT want to close the whole your position you able to close the position only partially. You must:
Click on the “close position” by the right mouse button, and type (!) the size of a lot, that you’d like tocloase manually… done! 
thank you…can we see pictures of exmaple?…. please
Fredy, thank you for comment….I’ll add screenshots soon