Text and Image size

Hi there,

I’d like to center the featured content one the pages because there are a lot of margin on the left.

Could you provide a link to the page where you want to do this?

Also I want to know how to change the size of the outstanding image because when you open the post the size is immense.

So the size can be changed, but it will shift to the left if that happens.
This reduces the size by 50%, and centers the image on the post:

.post-hero-image .entry-image {
    margin: 0 auto;
    width: 50%;
}

Paste that into the Appearance > Customize > Additional CSS area of your site.

Is it posible to have that image on the homepage but not on the real post when you open it?

Sure, you can use CSS to do this if you don’t have Jetpack installed:

.single .entry-image {
    display: none;
}

If you have Jetpack installed, you can go to Customize > Content Options >
Featured Images and uncheck the Display on single posts box.