Documents search from another Team Site in the same tenant

Hello Alpha221

as we texted private with your additional requirement:

I want to search other libraries' from my team site through the search box (Microsoft Search Box). 

It is possible to configure the Microsoft Search Scope:

https://docs.microsoft.com/en-us/microsoftsearch/manage-spo-search-box

> When all your team sites are associated to a hub

Other way is to configure a custom search page with the PnP Modern Search WebParts:

https://docs.microsoft.com/en-us/microsoftsearch/create-search-results-pages

https://microsoft-search.github.io/pnp-modern-search/

> for highly search customization with a free solution

Other way is to configure your own Microsoft Search Vertical. In your vertical you can add the URLs from the libraries, that you want to search: 

https://docs.microsoft.com/en-us/microsoftsearch/manage-verticals

Hope this information and links help you for a good solution.

Regards, Dave