Viewport's search is currently searching the whole page for content that might fit the query and displays this as it is. This includes instructional text.
There should be a change in behaviour or an option to hide the content that should not be visible to a user.
Scroll Viewport is using Confluence's own search index. Index entries contain all page content including instructional text as plain text. Unfortunately, this means that in the context of the Viewport search it isn't possible to tell whether the indexed content is actual page content or instructional text. This depends on a fix on Confluence's side.
For this reason, this issue will be marked resolved.