I am trying to add header using insert, but header/footer option is grayed out

I cannot add a header to a spreadsheet because, under Insert, the header/footer options are grayed out. Why?

Hello,

most probably because options

Format -> Page -> Tab: Header -> [ ] Header on
Format -> Page -> Tab: Footer -> [ ] Footer on

are deactivated.

Hope that helps.

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format page, select activate header and footer but if you close document or libreoffice you need to make it manual each time… what to do to fix it?