How to set the default Search location in a Finder Window

One of those small things that cause irritation out of proportion to their apparent significance and time wasting out of proportion to the task. 

In a Finder Window, search window top right, how do I default the search to the current folder and children? 

At the moment the search starts by searching whole Mac and I have to switch it manually to the current folder. 

My way of working is to use the top Search for computer wide searches, I only ever use the search in the context of a folder if I want items from that folder (or children)

I do notice questions about this stretching back to 2007! It's not OS Version dependent as far as I can tell - I am on Mojave so do let me know if this has been resolved since.