Option one (simple): In main menu (not while you are playing) go to Options and scroll all the way down. There will be three red buttons “Delete Save” (will start the game from scratch), “End Current Run” will start a new character from the settlement keeping everything else, and finally “Reset Everything” - will reset all settings to default and delete all statistics, save game.
Option two: Go to C:\Users(your user name)\AppData\Local\ — and delete folder “vinculike”. This is the same as “Reset Everything” button above, but also doesn’t write new configuration file.