Today I encountered a situation I've not encountered before: I have a project-wide stylesheet that should be used for everything, except one specific module that has different (brandable) stylesheets. I created a view.yml for this module with a different stylesheet, but of course the configuration files are merged so it doesn't actually overwrite the main stylesheet file. And this wasn't really what I needed here.

His technique involves a change to the main view.yml configuration file with a special syntax to remove the CSS file with a negation. A snippet is included to illustrate. You can find out more about view configuration in this chapter of the "Definitive Guide to Symfony".