Thank you for advice.
Follow your instructions I added line “display : none” to CSS in section /.site-title/ alike in /site-description/ and it’s working like I wanted to…
Tab name in Firefox is visible but on main page title and site description are invisible.
For SEO site have name and description, but text lines are invisible, main site looks better now.
In original, when you type name and description during theme personalization, this text was always visible.
In my situation woman on photo have beautiful hypnotic eyes. Eyes were obscured by a line of text. I couldn’t left empty cells in personalization form, because then tab name in web browser was also blank and also for SEO…site have to be named and described
Now it’s looks way better and theme is my new No.1 of all I ever tried!