I'm an openSUSE user, but not a Mate or LightDM user. I think you need to adjust the theme your LightDM is using. If you have /usr/share/glib-2.0/schemas/x.dm.slick-greeter.gschema.xml, and you want larger fonts, try changing its xft-dpi value from 96 to 120 or 144.
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