How can I get rid of the dismiss banner at bottom of iPhone 11pro max screen after a text message sent?

Hey there, and welcome to Apple Support Communities rishlan,

We can certainly understand your concern and can help provide some insight.

We recommend checking to these steps on how to manage and use notification and see if that helps.

" Manage notifications

To manage your notifications from the Lock Screen or Notification Center:

1. Swipe left over an alert or group of alerts.
2. Tap Options, then select from these options: 

• Mute for 1 Hour
• Mute for Today
• View Settings
• Turn Off

You can also tap View Settings to change your alert styles or alert settings for a specific app.

Change how notifications appear

Requires an iPhone with iOS 16 or later

1. Go to Settings > Notifications.
2. Under Display As, choose how you want notifications to appear on the Lock Screen:Count: Shows the total number of notifications at the bottom of the screen. You can tap the count to see notifications.

• Stack: Shows notifications stacked at the bottom of the screen, with the most recent notification at the top.
• List: Shows notifications in a list. "

For additional information, check out this link: Use notifications on your iPhone or iPad - Apple Support

If this is an alert, rather than a notification, and it only occurs when sending SMS, we'd suggest reaching out to your cellular provider regarding this matter. They'd be the best hands possible to assist when it comes to your cellular service.

Kindest regards!