I'm lost the Preserve Formatting Options in v3

I must be dumb, but when you check Preserve Formatting on the format menu after selecting a bunch of text, I can’t find the option to identify what gets preserved. I want to preserve the centering of text, but not font, thus allowing the ebook reader (the user) to choose font but keep my text centered. Did it get moved in version 3?

Preserve Formatting is a bit of a legacy feature at this point, since Styles do everything they did and more. What I would do is create a paragraph-only style with your alignment setting. Unless the compile format is set up to modify how a style of that same name is formatted, that should pass the formatting straight through without any further adjustment, and since it is a paragraph-only style, the font won’t be used.