I don't get it. Theoretically, I should be able to set view options in a Finder window (e.g. type of columns) and then, by choosing "use as defaults" apply them to all folders. That's what I've read. But it doesn't work. All folders keep the settings they had before. Only if I delete all ".DS_Store" files and then set a default view it is applied to all folders. Is there really no other way to change view options for all folders?