ibuffer-never-show-predicates

ibuffer-never-show-predicates is a variable defined in `ibuf-ext.el'.
Its value is

nil

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

Documentation:
A list of predicates (a regexp or function) for buffers not to display.
If a regexp, then it will be matched against the buffer's name.
If a function, it will be called with the buffer as an argument, and
should return non-nil if this buffer should not be shown.

You can customize this variable.