ProProfs Knowledge Base allows you to search content across all of your sites simultaneously. So, if a piece of content is in multiple locations across different sites or you are not sure of the location, you will be able to find it in a jiffy.
Here's How the Multiple Site search works
Just enter the keyword(s) in the search bar, and you will see the search results from multiple sites.
Benefits of Multiple-Site search
Include similar knowledge base to for relevant search results
Exclude private knowledge base from search results
Here’s How You Can Enable Multiple Site Search
In your ProProfs Knowledge Base
Step 1: Go to Settings > Configure.
Step 2: Navigate to the Search tab.
Step 3: Select the help site(s) and click Save.
That is all about multiple site search in the ProProfs Knowledge Base.