As shown in the picture, when using c-x c-o to complete, a new window will appear above the window, which will still exist after completion.
c-n There is no completion.
How to avoid the upper window appearing like c-n
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That window is called preview window, which can be controlled by setting completeopt. It can be disabled by setting the following:
set completeopt-=preview
You can also close any preview window via C-w z
My settings are:
set completeopt=longest,menuone
Detailed instructions can be found at:
help:completeopt
help:preview-window
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