How to turn off conversation view in this app ? I need each email one by one
The Gmail application doesn't have that option. However, you can access Gmail via the built-in email app, which is capable of deactivating Conversation View.
Instructions
1. Log into your Gmail account using your computer's Web browser. Click the gear icon, then "Mail Settings." Select the "Conversation view off" radio button, then click "Save Changes."
2. Press the "App Drawer" button on your phone, then tap "Email." Press "Menu," then "Accounts," then "Menu" again and "Add Account."
3. Enter your Gmail address and password, then tap "Next."
4. Enter a nickname for your account and tap "Done." You can now log in to your Gmail account by tapping "Email" at the main Android menu, and your messages will be displayed individually, without the Conversation View grouping.