How can I solve the Enter key not working in Delphi11?

I need help please,

I was programming in Delphi 11 normally, suddenly when I write a code or want to modify a code in unit and press the enter key on keyboard, the writing does not go down, only the cursor goes down.

I tried to close Delphi and then restart it, but the same problem still exists. I also turned off the computer and the same thing happened. Even if I opened a new project, the same problem remains.

You have probably inadvertently changed from Insert to Overwrite mode in the Delphi editor. There is a selection menu for it near the bottom left corner of the editor:

The Ins key also toggles between modes.