I'm running KDE Neon with version 5.11.1 on the user edition. There is a bug or some issue of sorts that doesn't apply change in the application style for gnome applications and GTK. I choose a choose GTK theme and font than click the apply button. When i close system settings and go back to the Application Style for gnome applications, the selected changes for GTK themes and fonts doesn't stay, while the previous selections in the Gnome widget style remain. Is there a bug on KDE version 5.11.1?

Same issue in my case I will try with some configuration tools other than KDE GTK configurator.

Thanks for the infro. I tried Lbuntu's theme tools settings and I beleive it worked for me. Use these two commmands in your terminal and pick the GTK theme/icons you want after starting the app.

sudo apt install lxappearance
lxappearance

Thanks again.

kde-michaelscott wrote: Is there a bug on KDE version 5.11.1?

Yes, the settings module doesn't load the settings properly. (It should *save* it fine though, it will just revert to the previous ones when you open it again)

Should be fixed in the latest 5.11.2 (released last Tuesday), though some problems apparently remained and will be fixed in 5.11.3...

https://bugs.kde.org/show_bug.cgi?id=382291