Hello. I have once seen a search box on a Confluence page but can't find the feature. I got pages with lots of content and would like the users to be able to search by keyword. Can you help me find this feature, please?
Yes, that's possible.
The Livesearch macro allows you to add a search box to a Confluence page. When users enter a search term into the search box, Confluence will dynamically display matching results as they type.
Here the link to the Atlassian documentation: https://confluence.atlassian.com/doc/livesearch-macro-163415902.html
The Search Results macro searches your Confluence site based on search terms specified in the macro parameters, and displays the results on thewiki page: https://confluence.atlassian.com/doc/search-results-macro-139511.html