There are many many posts in various places about the default behaviour of LO, especially with Writer showing every font in the OS, making the fonts menu a mess. Deleting some can help, but there can be dependencies issues. One can use ~./your_config_directory/fontconfig/font.conf to reject fonts for a user, but this can cause dependencies problems between applications for that user. See: https://wiki.archlinux.org/index.php/Font_configuration#Whitelisting_and_blacklisting_fonts
and other posts online.
Can I set up a similar xml file to blacklist (reject) fonts from LO (and where)? This would help so much; but then even better but not the first step maybe, managing fonts from within LO would be a nice interface to that file to achieve this.
If not, how can we get this onto a list for developers to address for LO updates?