Search finds docs, issues, projects and directories. Open it from the sidebar or with the keyboard.
What it searches
Titles first, then document text. Results are grouped by what they are.
Scope
Search covers the directory you are in. Other directories you can reach are offered separately, so you can jump to one without first switching.
Searching within a doc
Your browser's find is the right tool inside a single document; search is for finding the document.