Vim splits the window horizontally whenever i switch between buffers if i didn't get the data written to the disk first

Question

I currently use ctrlp to navigate between buffers in vim , but whenever i try to switch to another buffer it automatically splits the current window horizontally into two windows .
In order to avoid this or open the new buffer in a whole window i have to first write to the initial buffer at the disk then open ctrlp and switch to the second buffer .
How to get vim to open a new buffer in a full window rather then a split one ?

Answer 1

Probably you just need to :set hidden. Without it, you cannot "hide" a buffer with unedited contents; it must be written or wiped. My guess is CtrlP detects this case and splits open instead.