The cursor in the code editor has changed from a vertical bar to a horizontal one. How to return back?

Question

Code editor

I use brackets.
I did not understand how, but the cursor changed from a vertical strip to a horizontal one. And now, when I add code in the middle of the line, the code does not shift on the left, but is replaced by the one that is entered.
How to get back the normal cursor?

Answer 1

Click on Insert, damn it!