After reading How to set and keep your preferred default font in Word, Paul Reitman asked about doing the same thing in the free LibreOffice.
Not everyone wants to pay for their word processor and spreadsheet, and they often don’t have to. LibreOffice offers a reasonably powerful and versatile set of tools for free. It’s not for everyone (I still prefer Microsoft’s suite for a number of reasons), but for many people it’s a perfectly good substitute.
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And as with Microsoft Word, you can easily change fonts in the LibreOffice Writer document you’re currently working on. But you may have trouble figuring out how to change the default font–so that every new document will automatically have the font you want.
You need to start in LibreOffice Writer, not the umbrella LibreOffice program. From the menu at the top of the window, select Tools>Options to bring up the Options dialog box. In the left pane, you may notice–within the LibreOffice section–a Fonts option. Sorry; that isn’t the font option you’re looking for.
Instead, expand the LibreOffice Writer section, and select Basic Fonts (Western).
In the larger right pane, you’ll find five default fonts for different types of text. You want to change the top one–Default. There, select a font from the first pull-down menu, and if you like, a font size as well.

Once you make your selection, you’ll notice that it also changes the font for three of the other four font settings. You can change these to something else if you’d like. You can also change the Heading font–the only one that doesn’t change automatically with the default.
Make sure not to check ‘Current document only” before clicking OK.