By default unregistered users can see all your forums, they just can't post in them.
To change this in Admin CP go to "Forum Permissions" under "Forums & Moderators" and in these you can set custom permissions in each forum (or category) for each usergroup including Unregistered / Not Logged In.
You should consider through that blocking guest access to a forum also blocks a search engine from indexing it- so if you block too much content you will have very little indexed by Google and the others. This could prevent new members from finding your site when searching.
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