My Note:
In '.vimrc Setup' section, in place of this:
"" only show completion as a list instead of a sub-window
set completeopt-=preview
use this:
"" no preview window after completion
let g:ycm_autoclose_preview_window_after_completion=1
For more options, check: https://github.com/Valloric/YouCompleteMe#options
G. Schreiber, A. Stemmer, und R. Bischoff. IEEE Workshop on Innovative Robot Control Architectures for Demanding (Research) Applications How to Modify and Enhance Commercial Controllers (ICRA 2010), Seite 15--21. Citeseer, (2010)
O. Callaú, R. Robbes, \. Tanter, und D. Röthlisberger. Proceedings of the 8th Working Conference on Mining Software Repositories, Seite 23--32. New York, NY, USA, ACM, (2011)