i'm playing with settings manager, want to know is there a way to reset settings to default state?

[russly...@gmail.com]

In Dom0 in the setting under Preferred Application, I made few changes for Web Browser and Mail Reader and now I don't remember what was the default selection for them.... and if none, how to set it to none, because I've tried and cannot set to none...

[awokd]

Mine are set to "No application selected". Try looking around in the
~/.config folder, they might be saved somewhere in there.