How to control the actual font used for special characters? [closed]

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The only way to be sure what font is used, is to manually assign it.

While it is possible to configure the local system to use the fallback of one's choice somewhat, it is of course not guaranteed that another user has the same setup.

On Linux, font-fallback is done with help of fontconfig, and an additional built-in/shipped list of default/well-known fonts and their fallbacks (mainly for inter-os compatibility).

That all being said: Having "Deja Vu Sans" as a fallback for "Times New Roman" - such a fallback doesn't make much sense in general, as one is a serif font, the other one without serifs. So replacing one with the other significantly changes the look of a document. But anyway, I got distracted.

The list is in VCL.xcu in the sources officecfg/registry/data/org/openoffice/VCL.xcu - in the installed product, the various configuration files end up in main.xcd (/opt/libreoffice3.6/share/registry/main.xcd) - but I don't think there were any changes. Are you comparing on the very same computer, with the very same set of fonts installed and only the version of LO being different in the screenshots?

You can create custom replacement rules in Tools | Options → LibreOffice → Fonts In the Font box enter "Arial Unicode" (or whatever the font is actually called, in the replace with insert Deja Vu Sans and make sure to check the [x] always box, (& screen too, as you want the replacement to also apply to your on-screen display) otherwise it would only be applied in case Arial Unicode is not installed.

PS: Starting with wiki questions is bad, as you cannot get karma with it - there is little use for using wiki-style question for actual questions like this.