Thanks to Ilya, I have understood the mistake, I changed only a heading class
But then I don't understand point 4 of the instruction
- In your Form&Content type navigate to the View tab
- Select or create a field that will be used for page title and copy its name (e.g. art_introtext).
- Click on the Configuration tab on the right side.
- Now you can see "Override Title" textbox - enter selected field's name.
This that field which is called now (Title *)?
Whereas to divide Taytl and an internal name?