Dear Beatrice Seck,
Good day.
After thorough research and consulting, it’s been concluded that the feature you are inquiring about is currently unavailable. Microsoft Teams does not currently offer a way to remove the "This message has been deleted." placeholder after you delete a message. This is a known limitation and there isn't a built-in feature to completely erase these notifications.
As workaround you can try to reset the teams app and check if there is any difference.
- Type settings in the search box, and then select the Settings app from the results.
- Select Apps > Installed apps, and then type Microsoft Teams in the search box.
- Locate the New Microsoft Teams app from the results, select the More options button (...) on the right, and then select Advanced options.
- In the Reset section, select Reset.
- Restart Teams.
and check
We apologize if we are not able to meet your requirements; however, thank you for bringing this to our attention, we will surely raise you concerns to our Product Team and hopefully this can be included in the future updates.
In the meantime, please feel free to post this in our Feedback community by visiting Microsoft Teams · Community as it is a community monitored by our Product team to help improve user experience with Teams, via feedback given by our valuable customers.
For other concerns, please do not hesitate to add you post in the Microsoft Community Team.
Thank you for choosing Microsoft as your partner in business.SincerelyEben Ezer Tres | Microsoft Community Moderator