I had a problem using Libreoffice Fresh 6.1.1 in KDE when trying to save a document using the ‘Save as’ option. This causes Libreoffice to freeze, with soffice.bin using 100% of one of the CPU cycles. Doing a force quit then results in the process lo_kde5filepick running at 100%. This continues unless this process is also forced to quit.
Others have had the same problem, see:
This seems to be related to Libreoffice Fresh now using KDE dialogues for saving new files. A temporary fix is to enable SAL_USE_VCLPLUGIN=gtk3 in
/etc/profile.d/libreoffice-fresh.sh by uncommenting this line. This results in Libreoffice going back to using the GTK ‘Save’ dialogue and prevents any freezing or high CPU usage for me.