It appears that adding a line to /usr/share/xdg-desktop-portal/kde-portals.conf fixes the issue. This should be added to the xdg-desktop-portal-kde package, which the file belongs to.
[preferred] default=kde + org.freedesktop.impl.portal.Settings=kde;gtk;
It appears that adding a line to /usr/share/ xdg-desktop- portal/ kde-portals. conf fixes the issue. This should be added to the xdg-desktop- portal- kde package, which the file belongs to.
[preferred] .impl.portal. Settings= kde;gtk;
default=kde
+ org.freedesktop