The page https://help.libreoffice.org/24.2/en-US/text/shared/optionen/01060500.html?System=UNIX&DbPAR=CALC&HID=modules/scalc/ui/optcalculatepage/OptCalculatePage#bm_id3149095 does not explain the multithread setting. Page is Tools - Option - LibreOffice Calc - Calculate Note: while editing the Help page, it is important to reorder the contents following the dialog layout and fill whatever is missing in the settings, if any. The patch that added mutithreading can be investigated, starting from https://gerrit.libreoffice.org/c/core/+/46782/
I'm not seeing any explanation of this either in: Version: 24.8.0.0.alpha1+ (X86_64) / LibreOffice Community Build ID: 45f9627659e882b9157782dfc5981e31567a306e CPU threads: 8; OS: Linux 6.8; UI render: default; VCL: x11 Locale: en-US (en_US.UTF-8); UI: en-US Calc: CL threaded Changing to "New".