Hi atDev,
You can manage this by:
1. Using permissions or
2. Disable the add-blog-post-button plugin under system plugins (Confluence Dashboard Plugin).
There's no one-click solution to turn off the blog for all spaces, however you can
This will hide the link to the blog, but it will not remove everything blog-related (e.g. the 'Blog post' content type when clicking 'Create' will remain).
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