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Custom CSS for full post vs. excerpt (Content Options)

Is there a way activate “Full Post” via Custom CSS or any other way?

Right now I am stuck with Excerpts on the Homepage and my Theme Customizer > is missing Content Options

Here below is what my theme (named Blog Writing) should provide but does not :/

Or could this be used? https://gist.github.com/thefuxia/2973189

Thank you