In the AppImage-Version 5.1.0 on arch linux with no kde-package installed, there are no themes listed in the Menu Setings/Color Theme. I copied a breezedark.color-file to /usr/share/color-schemes/ but that did not have an effect.
The appimage (and, according to a report elsewhere, the Windows installer) lacks any non-default colour schemes and doesn't read the global system configuration. This makes the new menu somewhat useless. The appimage does appear to read from ~/.local/share/color-schemes/ , so you can put your preferred colourscheme there.
Git commit 6c7f7901fc80c133355e88415a6145a4fab508a0 by Kevin Funk. Committed on 24/05/2017 at 09:45. Pushed by kfunk into branch '5.1'. appimage: Also install color schemes FIXED-IN: 5.1.1 A +19 -0 appimage/install_colorschemes.sh M +6 -1 appimage/kdevelop-recipe-centos6.sh https://commits.kde.org/kdevelop/6c7f7901fc80c133355e88415a6145a4fab508a0