[Theme Horse Support Team]

Hi Markus,

Are you asking to have the Image Gallery OR Image Slider?
If you are asking to set the Image Slider then Go to Appearance > Customize > Ambition Theme Options > Featured Content settings > Slider type > Image Slider and refresh the page and again go back to Appearance > Customize > Ambition Theme Options > Image Slider Option where you can set the image slider.

Thank you!