How can I remove the gray box covering text after latest iOS update on iPhone?

"How can I remove the gray box covering text after latest iOS update on iPhone?"

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See if this is what you need...

Ridding of Grey Box in Messages Wile Typing:

1. Go to: Settings
2. Tap: Apps
3. Tap: Messages
4. Scroll to: Text Messaging
5. Toggle Off: Show Subject Field

"Grey box covers text: What’s with the gray box covering text after you start typing after the latest update"

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Grey Box Covering Text:

Where are you typing this? In a textbox that has text that is dulled out, then that means it cannot be changed. This is something you typically see for required info that cannot be changed, such as your name when logged into an account.