How change metric to imperial ruler in writer document?

My script instructions for formatting the page tab stops are in imperial, my writer document rulers are in metric? How do i toggle between the two?

(menu):ToolsOptionsLibreOffice WriterGeneralSettings (measurement unit)

(5.0.0) You have the option of:-

  • mm
  • cm
  • inches
  • picas
  • points

If this helps then please tick the answer (:heavy_check_mark:)

…and/or show you like it with an uptick ()