ido-ignore-buffers

ido-ignore-buffers is a variable defined in `ido.el'.
Its value is

("\\` ")

Documentation:
List of regexps or functions matching buffer names to ignore.
For example, traditional behavior is not to list buffers whose names begin
with a space, for which the regexp is `\` '. See the source file for
example functions that filter buffer names.

You can customize this variable.