Hello! I’m here to help. It sounds like you're experiencing some issues with the Quran 13 Line app, where it opens to a blank screen and your bookmarks are missing. Let’s try to get this sorted out together.

To start off, could you let me know if you’ve tried any troubleshooting steps so far, like restarting the app or your device? Also, are you able to see any error messages, or is it completely blank?

In the meantime, here are a few initial steps we can take:

1. Close and Reopen the App: Sometimes just closing the app entirely and reopening it can solve these issues. Make sure to swipe it away from your recent apps.

2. Restart Your Device: This can help clear out any temporary issues that may be affecting the app performance. Just hold down the power button and select "Restart."

3. Check for Updates: Ensure that your Quran 13 Line app is updated to the latest version. Go to the Google Play Store, search for Quran 13 Line, and see if there is an "Update" button.

4. Clear Cache: Clearing the app's cache might help. Go to Settings > Apps > Quran 13 Line > Storage > Clear Cache.

Let me know how it goes or if you need more detailed guidance on any of these steps!

When I open app,it's blank and bookmarks have disappeared