I've noticed that LibreOffice Calc disables the footer settings when you want to make use of it in a Calc document. When you enable the footer function and make use of it, it disables it every time when you restart a saved document. Re-saving the document again and re-opening it gives the same result: the footers are disabled again. It just doesn't remember the setting. Info about LibreOffice: Version: 7.2.1.2 / LibreOffice Community Build ID: 20(Build:2) CPU threads: 4; OS: Linux 5.11; UI render: default; VCL: gtk3 Locale: nl-NL (nl_NL.UTF-8); UI: nl-NL Ubuntu package version: 1:7.2.1-0ubuntu0.20.04.1~lo1 Calc: threaded Cheers!
*** This bug has been marked as a duplicate of bug 144940 ***