The request is having the option to have a permanent "space" where buffers are listed.

An external example is C-x C-b (list-buffers) in Emacs.

Actually, this is "solved" in ViM by plugin https://github.com/bling/vim-bufferline, but it does not work well, as bufferline disappears after some actions and it does not show all buffers when there are too many. Further, it is not updated since 10 years ago.

For me, both options, a small window or a line would fit, although they should be big enough to show all open buffers (so for example, when a line is not enough, then 2 lines).

Of course, there would be come command to toggle displaying or not this buffers-space.

Thanks!