Indicates whether the Sucheinstellungen [Search settings] button shall be shown. Default: "Yes".
When clicking the button the dialog box Einstellungen [Settings] with selected item Suche [Search] is opened.
[PARTdataManager] INDEX_SHOW_SEARCH_SETTINGS=YES/NO
Even if the button is not displayed you can reach the setting options via Extras menu -> Einstellungen... [Preferences...] -> Suche [Search] dialog -> Allgemein [General] tabbed page.