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Is it possible to read another person’s message on Instagram without letting them know?
If you have been sent a message on Instagram and you have reviewed it, then under the dialog will be marked "Viewed".
How to disable it:
1. Go to application settings.
2. Open the "Settings" section.
3. Scroll down and select "Accounts with limited access".
4. Click the "Continue" button.
5. Enter the user login in the search field.
6. Click the "Restrict access" button.
After these actions, you can open a dialog with the user and read the messages sent. They are not marked as “seen”.