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Is there an option to show always the category-page:
https://example-forum.com/
Per config we have set Discourse to be public, but login is required to post/answer.
The homepage is set to show the category-boxes.

Current Situation:
User lands on forum https://example-forum.com. Logs in and lands on the page with the category-boxes.

For new Users however, if they register there is a redirect to https://example-forum.com/top/monthly.

Correct, redirecting to top upon long (or total) absence is a feature. You can disable it in site settings as I recall.

The idea is to show the user your best content (top) to attract them to your site.

Correct.

image

Is there any way to set up a custom URL or URI to redirect new users to instead?

Not by default but doable in a plugin.