Some Applications are not listed in the Systemmenu of KDE. One example for that are AppImages.
But it is quite easy to add them to the Systemmenu.
You only need to create a .desktop
file in ~/.local/share/applications
.
[Desktop Entry]
Type=Application
Name=Zettlr
Comment=Zettlr
Exec=/home/n5557/software/zettlr/Zettlr
Icon=/home/n5557/software/zettlr/zettlr.png
Terminal=false
Categories=office
After that you will find your Application in the Systemmenu