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
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)
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)