Linux has that same search box. And it is searching before you are even done typing what you want. It will give you so many related results such as hidden config files you have to narrow your search terms like Paul actually wants to do. If it is there it will find it for you...
The file manager is one tool where Linux really does shine.
I use a program called “EVERYTHING”... It is free and fast and uses little CPU...
https://www.majorgeeks.com/files/details/everything.html
It has in the upper corner a selection for searching just certain files... I mostly use it to search audio files, but there is pictures, video, documents, excusables, folders, and compressed options.... (or all)... Not sure if it will search text in documents or not.
A quick search comes up with this that says it will search through documents... but it may not be fast since it does not previously index them...