Hi there! I understand your Library app is not appearing on the screen at all. Just to clarify, when you say "not come up on screen," do you mean the app does not open when you tap it, or does it open but show a blank or error screen? Also, are you using the Libby app or another library app?

Meanwhile, here are some initial simple steps you can try on your Android 10 device with WebKit browser environment:

1. Close the library app completely. If you are using the browser version, close and reopen your browser.

2. Restart your device. This helps clear temporary glitches or memory issues.

3. Check your internet connection to ensure it is stable and strong.

4. Clear the app's cache:
- Go to Settings > Apps > [Your Library app, e.g., Libby]
- Tap Storage
- Tap Clear cache

5. If the problem persists, try removing your library cards or account login from the app and then adding them again.

If you have already tried these or the app still won’t load, please let me know what you’ve tried and any error messages or behaviors you notice. From there, I can guide you through deeper troubleshooting steps.

Does that sound good?