I've removed Kate from favourites by right click "Remove from favourites", modified all files in my home directory which grep found containing "preferred://". Every time after reboot, Kate is back in the list of Favourites Operating System: Fedora 30 KDE Plasma Version: 5.15.5 KDE Frameworks Version: 5.59.0 Qt Version: 5.12.4 Kernel Version: 5.2.9-200.fc30.x86_64 OS Type: 64-bit Processors: 8 × Intel® Core™ i5-8250U CPU @ 1.60GHz Memory: 15.3 GiB of RAM ADDITIONAL INFORMATION Maybe related to https://bugs.kde.org/show_bug.cgi?id=385814
Indeed. *** This bug has been marked as a duplicate of bug 385814 ***