Confluence - can users search in within a particular page for content?

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: Livesearch Macro | Confluence Data Center and Server 8.0 | Atlassian Documentation

The Search Results macro searches your Confluence site based on search
terms specified in the macro parameters, and displays the results on the
wiki page: Search Results Macro | Confluence Data Center and Server 8.0 | Atlassian Documentation