vim - Move vim function definition window to bottom

Question

As you can see, vim pops up a window with definition of the function completion on the top (I don't know what its name is...), can I move it to the bottom?

Answer 1

Put the following line in your vimrc. (Relevant help page)

set splitbelow

This causes all horizontal window splits to be put on the bottom.

Answer 2

Add below script to your vimrc file

"Preview window on the bottom of vim
function! PreviewDown()
    if !&previewwindow
        silent! wincmd P
    endif
    if &previewwindow
        silent! wincmd J
        silent! wincmd p
    endif
endf
autocmd BufWinEnter * call PreviewDown()