It used to be that I could do this using dconf-editor, but the dconf tree seems to have changed quite a bit since I last did this.
I want to add new categories in the applications menu under arcmenu, and move some of the apps in submenus around.
I was expecting this to be easy, but I’ve spend several hours searching for a solution with no luck.
This has never been something you could do in dconf-editor.
The menu is “composed” automatically based on the information in the .desktop launcher files, which are installed along with graphical applications. Updating these launchers will update the menu.
There are dedicated tools to edit the menu through a graphical interface, such as menulibre or alacarte. These can be installed using dnf.