Thin content can really hurt your SEO. If there is a thread on your XenForo forum that does not bring value to users or isn’t suitable to be indexed by search engines, you can exclude it from showing up on Google with a meta robots noindex tag.
To get started:
Step 1: Visit the thread that you want to remove from search results.
Step 2: Click on the More options menu. Select ‘Edit metadata‘.
Step 3: Select Yes for Noindex and click Save.
In addition to noindexing individual threads, you can also noindex pre-built XenForo pages such as member profiles.