If do you change Document background (menu Tools
- Options…
- LibreOffice
- Application Colors
), all modules (Writer, Calc, Draw, etc.) documents will show this color (#AADDFF in the following image). Text color is specific to Spreadsheets. This does not affect printing, only visualization.
If do you want to change new spreadsheets cell background color, you can modify the default cell style font color and select background color, but this will affect the way cells are printed.
Tested with LibreOffice 6.3.6.2 (x86); OS: Windows 6.1.
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