In WhatsApp, you won’t be able to see deleted message in a conversation window. This is quite understandable since the person who deleted their message may accidentally sent a wrong content and should be seen by you.
However, if you curious, you can store WhatsApp messages even after it deleted — with the help of an app.
In this guide, I will show you how to recover deleted messages in WhatsApp. Please note that you can only see the deleted messages that sent after you followed this tutorial.
1. Download and install Notification History app from Google Play Store.

2. Open the app, it will ask permission to enable Accessibility. This action will allow the app to read the notifications.

3. Now, the app will ask you again to activate Notification Access, please just give it the access.

4. Finally, Notification History will keep track incoming messages from WhatsApp.
Although the messages might be deleted, Notification History already duplicates them and you can read it later. Again, the app won’t be able to recover deleted messages if it was not running.