To resolve the issue where only the table of contents opens in the Deseret Bookshelf app and selecting a chapter does not yield any results, follow these steps:

1. Update the App: Ensure that you have the latest version of the Deseret Bookshelf app installed on your iPhone. Go to the App Store, search for Deseret Bookshelf, and tap 'Update' if available.

2. Check iOS Compatibility: Confirm that your device's iOS version (17_7) is compatible with the version of the app you are using. Outdated operating systems can cause functionality problems. Make sure your iPhone is updated in Settings > General > Software Update.

3. Force Close and Reopen the App:
- Swipe up from the bottom of your screen (or double-click the Home button) to access the app switcher.
- Swipe the Deseret Bookshelf app off the screen to close it.
- Reopen the app to see if the issue persists.

4. Reinstall the App: If the problem continues, try uninstalling and then reinstalling the application.
- Press and hold the app icon until options appear, then tap 'Remove App.'
- Go to the App Store, search for Deseret Bookshelf, and reinstall it.

5. Reset Network Settings: Sometimes, connection issues may be the cause.
- Go to Settings > General > Reset > Reset Network Settings. This will not erase your data but will reset your Wi-Fi networks and passwords.

6. Contact Support: If none of these steps solve the problem, reach out to Deseret Bookshelf support for further assistance. You can find available help options by visiting their FAQ page here - [learn more].

This step-by-step guide should help in resolving the issue you're experiencing with the Deseret Bookshelf app.