Change the default formatting toolbar background color in Calc?

On the formatting toolbar in CALC, the default background color is bright yellow (255,255,0). I don’t use bright yellow and I’m tired of selecting the color I want from the drop down list for every document I use. How can I change the default CALC background color on the formatting toolbar from bright yellow to something else?

This option doesn’t appear in Tools, Options, LibreOffice, Appearance. Modifying bright yellow in Tools, Options, LibreOffice, Colors to something else has no affect.