Hello thanks for your answer. I Shared you my details in private content.
1. How can i setup that the Blogpage is in full width. (only the Blog page)

2. In the Theme Settings i can Setup a Blog Title. How i can change it to the Pagename. I tryed to create a Shortcode that shows “the_title();” but it doesnt work in the blog title. (On this Page you can see the Shortcode “[pagetitle]”)

3. You can see, i changed the Backgroundcolor to grey… now all links are having a grey background to. Why (Footer and header), how can i fix it?

Thanks for your anwser.