LibreOffice Writer from Fedora’s repositories renders characters differently from the standard Writer.
Writer issue

On the left Flatpak Flathub version on the right Fedora’s

I think it is worse (notice the blur under the letters).
I recommend to use the Flatpak version from FlatHub or the community version from official LibreOffice site.

I’m not the only one having seen this:
https://www.reddit.com/r/Fedora/comments/wkgxt6/blurry_fonts_in_libreoffice_writer_only_in_fedora/

In that post there’s also a possible explanation, this patch could be the culprit:
https://src.fedoraproject.org/rpms/libreoffice/blob/f36/f/0001-tdf-144862-use-resolution-independent-positions-for-.patch/

From my tests it seems only a problem only with Writer.