You can enable the web app to auto-scroll the document as it reads it out on your PC, desktop or laptop

Sign in to app.speechify.com using your Speechify account credentials, preferably using a Chromium browser.
Open the file that you want to listen to.
Click on 'More' on the left side toolbar and enable the 'Auto-Scroll' toggle under the Display section.
This feature will let the web app auto-scroll the document along with the reading.

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How do I enable auto-scroll as the web app reads my document?