Hello,
the list is stored in file $HOME/.config/libreoffice/4/user/config/fontnameboxmruentries
. Hence you need to (in this order):
- Stop LibreOffice application
- Delete the file
Note If you delete the file before you stop LibreOffice the file will be recreated from memory
( sorry for my wrong comment above, made a test, list was cleared and wrote my comment and now can’t explain why this happened)
Tested using LibreOffice:
Version: 6.4.2.2; Build ID: 4e471d8c02c9c90f512f7f9ead8875b57fcb1ec3
CPU threads: 8; OS: Linux 4.12; UI render: default; VCL: kf5;
Locale: en-US (en_US.UTF-8); UI-Language: en-US; Calc: threaded