Explanation
Approving articles from the Knowledge approval page to Publish is a necessary step to make articles visible in all the selected channels after implementing a review process for all new knowledge articles. The Knowledge approval page is a page that shows all the articles that are pending approval or have been approved or rejected.
Approving articles from this page will change their status to Published, which means they are visible in all the selected channels, such as internal app, customer community, or public knowledge base. Verified References: :
https://help.salesforce.com/s/articleView?id=sf.knowledge_approval_page.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.knowledge_article_visibility.htm&type=5