New static main page issue

Hi!
I am finishing a simple page based on your theme (Preschool and Kindergarten theme). I have a problem.
I deleted the page that was set as the home page by default. I have created a new one that I would like to set (that page) as the statically displayed homepage – Name = ‘Start’.
In the theme settings I choose it as the main one.
But:
1) The title of the newly set homepage appears in the title of the site, not sayings, ie “Start – Main title page”. It should show “Main title page” correctly.

2) Unfortunately, the newly created statical home page does not show any content when you enter it (the text is written).

What Am I supposed to do?

Thanks for help!