How can I prevent other buffers replacing coc-explorer in its window?

[bty102]

what should i do?

[weirongxu]

Why would other buffers replace coc-explorer?

For another plugin's functionality to replace the buffer, this requires plugin to exclude coc-explorer, such as https://github.com/weirongxu/coc-explorer/wiki/FAQ#use-with-yggdrootindentline-or-nathanaelkanevim-indent-guides

For your own Vim scripts, you should check the 'filetype' of the buffer you want to replace by yourself.