Hi! I understand that the "Learn" feature on your Knowt app is showing a blank screen or not displaying content, is that right? To help you best, could you tell me if this happens with all flashcard sets or just specific ones? Also, are you using the app on your Mac directly or through a browser?

Meanwhile, here’s a step-by-step approach to try and resolve this issue on your Macintosh running OS X 10.15.7:

1. Refresh and Restart:
- If you’re on a browser, try refreshing the page or closing and reopening the browser.
- If using the app, quit it completely (Cmd + Q) and relaunch it.

2. Check Internet Connection:
- Make sure you have a stable internet connection as learn mode needs to load content from Knowt servers.

3. Clear Cache or Data:
- In the browser, try clearing your cache (under Safari Menu: Safari > Preferences > Privacy > Manage Website Data > Remove All).
- For the app, if possible, sign out and sign back in to refresh your session.

4. Update the App or Browser:
- Ensure your browser or the Knowt app is updated to the latest version compatible with your macOS Catalina (10.15.7). Outdated software can cause display issues.

5. Check Flashcard Selection:
- When you use Learn mode, you need to select flashcards in your Library and then choose “Learn” to study. Make sure you have correctly selected the flashcard sets to display content3.

6. Network Restrictions:
- If you’re on a network that blocks certain content, it might prevent the Learn feature from loading. Test on another Wi-Fi or network to see if that makes a difference5.

If these steps don’t resolve the blank display, there might be an issue on Knowt’s side or with your account settings. I can help you escalate for deeper support or check if there's a known outage.

Let me know which of these steps you’ve tried already or if you want me to guide you through any of them! Are you satisfied with this initial support?