[Theme Horse Support Team]

Hi Markus,

Go to Appearance -> Customize -> Ambition theme options -> Custom CSS paste the below CSS code and Click on Save & Publish button at the top of the options panel.

.featured-slider .featured-image {
    max-height: 200px;
}

We have spend lots of time and efforts to develop this theme available free for you.
Could you also please help us rating this theme in WordPress Repository.
https://wordpress.org/support/view/theme-reviews/ambition
We really appreciate your rating.

Thank you!