Whenever I highlight a block of text and attempt to change the font, either clicking on an option or merely opening the menu crashes Calligra. This is enough to make me prefer LibreOffice over Calligra, especially with the amazing integration it has with KDE's Breeze theme. Currently trying to reproduce on KDE neon Developer. Currently, I know it happens on neon User.
EDIT: No longer an issue on KDE neon Developer 5.9.90