iswitchb-buffer-ignore

iswitchb-buffer-ignore is a variable defined in `iswitchb.el'.
Its value is

("^ ")

• This variable may be risky if used as a file-local variable.

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.