Ctrl+F is find in current file by default I believe. If you use Ctrl+Shift+F then that is find in files. Then ensure you have selected the Entire Solution, that you don't have any file filters applied and try again. A screenshot would be helpful so we can see what you're seeing.
Search has been evolving in VS 2022 so it would be useful to know what version of VS 2022 you're currently running as well.