How to set `echo: false` for all files in a Quarto website

I know how to set echo: false in a single code chunk and in an entire Quarto document (with execute). But how I can set echo: false for all the Quarto documents in a single Quarto website without having to set it by hand in each of the documents?

You can set option more globally in your _quarto.yml or a shared metadata file (for a subfolder for example)
See Quarto - Project Basics about shared metadata

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