Hello Bettina,

In our theme already blog template have set. this is our demo blog site
https://luzuk.com/demo/interior-decor/blog-2/

You can also add sidebar also in blog page
https://luzuk.com/demo/interior-decor/blog-with-left-sidebar/
https://luzuk.com/demo/interior-decor/blog-with-right-sidebar/

Currently, you are set blog as simple post page that is why all blog post shows simple.
“aktuelles” this page is set as simple post page. You have to select blog template from Page attribute in this “aktuelles” page.

Follow below steps for set blog template set
Step 1. Go to Dashboard >> Page.
Step 2. Click Add New button.
Step 3. Select “Blog Full Width” template at right bottom of page
Step 4. Click publish button.

This is our theme documentation you may follow
https://luzuk.com/demo/interior-decor/documentation/

We got your message credentials but still it doesn’t get apply. Page contentiously get loading.

If you have any other issue then send us in our [email protected]

Thank You.