Why buffer tab plugin not work with Neovim 0.4

Question

I installed the latest Neovim 0.4 from scratch, install 'vim-plug', then add only 4 lines to my init.vim:

call plug#begin('d:/neovim/nvim/plugged')
Plug 'ap/vim-buftabline'
set hidden
call plug#end()

Then create two buffers with

:badd aaa
:badd bbb

Then it looks like this

I trid different plugins like vim-buftabline, vim-wintabs, vim-airline, same issue, it must be problem with the configuration, what do I miss?

Answer 1

Finally I found why. There's a command to disable the tab.

:Guitabline 0

And the document