This works with VS2017 and open-folder project (usually for CMake project)
Fuzzy Search defaults to search every files in the workspace folder.
Click Tools > Fuzzy Search to open up the search window (or you can map "Tools.FuzzySearch" to a shortcut in the shortcut setting window)
To only list files for specific subfolders, list them separated by new line in ".fuzzysearchsettings" file in your workspace folder.
Close Fuzzy Search window using "Tab" or "Esc".
Use key up and down to move through the search results and press enter to open the file.