OpenOffice's formula writer (as any "office suite 'formula writer'") is meant for simple formula writing, if you're doing anything beyond a one-liner (and a short one even then), consider using one of the TeX packages instead, for example LaTeX (TeX is a typesetting language, and it makes writing complicated, long mathematical/technical things as easy as laughing once you get the grips of it - which you do almost as quickly as you get the grips of OpenOffice's or MS Office's cryptic usage of FormulaWriter, or your favourite image editing application, or your language as a child).
There are probably gimmicks "hidden" in the thing, but my rule of thumb is that if <name your Office suite here> formula writer doesn't have a big plain button for it, you either can't do it or shouldn't waste your time nor nerves trying.
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