Die Hilfe ist doch im Gegenteil sehr ausführlich...
https://docwiki.embarcadero.com/Libr....DisplayFormat
Zitat:
Thousand separator. If the format string contains one or more "," characters, the output will have thousand separators inserted between each group of three digits to the left of the decimal point. The placement and number of "," characters in the format string does not affect the output, except to indicate that thousand separators are wanted. The actual character used as the thousand separator in the output is determined by the ThousandSeparator global variable. The default value of ThousandSeparator is specified in the Number Format of the Regional Settings section of the Windows Control Panel.