Indo por Bug 66545 - FORMATANDO: Desabilitando o sombreamento de campo cinza de hiperlinks no CALC , não há muito que você possa fazer.
Este é um bug conhecido, e o comentário final de Owen Genat de 2013-07-26 diz:
This appears to be a bit of an awkward bug. It is evidently a very old problem inherited from the original OOo code. Related AOO bug is https://issues.apache.org/ooo/show_bug.cgi?id=37988 which references v1.1.3. As such I am setting the status to NEW as I feel this is a confirmed issue, it is merely the solution that is unconfirmed.
I believe that the way in which hyperlinks are handled in Calc, needs to be made consistent with how they are handled in Writer i.e., via styles-based formatting. This would require implementing character styles in Calc.
By way of comparison, a hyperlink in Writer is controlled by the character styles Internet Link and Visited Internet Link. Unchecking the option in question (or using CTRL+F8) in Writer does remove the grey highlighting of, for example, a cross-reference field, but does not affect the appearance of a hyperlink. It is probably also worth noting that the option is listed beneath the Text Document, rather than Spreadsheet, section.
The term "field" in particular seems to cover a broad range of possibilities with regard to shading. For example, certain Unicode characters like Zero Width Space (U+200b) and No Break Space (U+00a0) are currently included. These Appearance options probably require a reworking.
Implementar estilos de caracteres no Calc, semelhantes aos do Writer, parece-me uma bonita tarefa ambiciosa. Embora você possa ser capaz de codificar no código-fonte algo mais do que o plano de fundo atual.