Control whether a record is shown in the list, based on a conditions reference evaluated at runtime.
!defs(extra_options_showable_if_pattern_1_always_defs.yaml)!defs(extra_options_showable_if_pattern_2_never_defs.yaml)!defs(extra_options_showable_if_pattern_3_conditional_defs.yaml)showable_if must be a hash using the standard conditions syntax.