Conditional formatting will be very helpful for me, but it’s a black box with respect to Styles. See screenshot. With Show Previews checked, there are no previews. And there are dozens of Styles. How does one work with this? Is there another way I have not discovered? Thanks.

Bug 151142 - UI: Font Preview in the Styles sidebar is not working for Calc
Workaround: In a separate sheet, fill some cells with numbers and apply a cell style to each cell then rename the cell styles to give a meaningful name