Hi @mengeco!
I’m sorry, but the Fullpage responsive mode is only available in the Pro version of Smart Slider:
https://smartslider3.helpscoutdocs.com/article/400-responsive-mode-fullpage
This can give you a slider, which has the exact height of the page.
Auto responsive mode means, that your slider’s size is based on the Slider size value:
https://smartslider3.helpscoutdocs.com/article/59-slider-size
and this ratio is used, as you make the screen smaller or bigger. So in the Free version the best you can do is to adjust the Slider size – height, to the value you find closest to your goal.
There are other features, which could modify the size, like the minimum and maximum height and width:
https://smartslider3.helpscoutdocs.com/article/398-responsive-mode-auto
which could give you a good responsive result on bigger and smaller screens too.
Content mode layers are also changing the height:
https://smartslider3.helpscoutdocs.com/article/1669-everything-about-slider-size#content-editing-mode
(which would modify the height of Fullpage responsive mode sliders too), so you should make sure you are only using as many layers, as much space you want them to occupy.
