How can I search for the files in my library on the computer?

You can directly search for the files in your Speechify library on the web app

1. Sign in to app.speechify.com using your Speechify account credentials, preferably on a Chromium browser.
2. The home page is your Speechify library, and there is a search bar on top of the screen which you can use to search for any files in your Speechify library.