Right now there are only two places where you can access the search function:
- Directly from the homepage
- From the search results page
Given that search is so important i think it would make sense to provide access to the search functionality on *all* pages. Maybe there could be a search input form in the blue menu bar (next to the language select button). Alternatively, i would suggest at least providing a direct link to the search page (that would be) https://toolhub.wikimedia.org/search from the main (hamburger) menu.
Especially if people are landing on another page than the homepage (e.g. a tool page) it's not obvious at all that the hub can be searched.