How can I change the number of shown posts on a page.

Now my home page shows two blogposts with a big picture, followed by 8 posts with a smaller picture. How can I change it that there are 4 posts with a big picture ?
Here is my website so you can see what I mean :

Hi @ikkegoemikke,

I hope you are well today and thank you for your question.

First in your site Reading Settings set the option “Blog pages show at most” to 4 as shown in the attached screenshot.

Then to display them full width, add the following CSS code in the Custom CSS option of your theme on the below path.

Admin Area -> Appearance -> Customize -> Additional CSS

.half-posts #page {
    width: 100%;
    clear: both;
    padding: 0;

Best Regards,