code-snippets/hide-disabled-filter-options-for-select2/hide-specific-filters-style.css

/* Hide disabled (empty) options for select2 in specific filters only */
/* Add the class hide-empty-select2-options to a Filter Posts module or to a particular Filter Item to hide empty options for that particular Filter Posts module or Filter item only */
.hide-empty-select2-options .select2-results__option--disabled {
    display: none;
}