LibreOffice for Plasma will be getting a new look soon courtesy of the LiMux project.
Talking at the LibreOffice Conference 2017 last week, Katarina Behrens explained how she was porting the KDE plugin for the LibreOffice UI to Qt5. The new version of the plugin promises better Wayland and HiDPI support, and will bring back the native Plasma file picker.
Find out more: https://eang.it/libreoffice-conference-2017/