https://doc.themesandco.com/customizr/#image-sizes
Full size slide has no fixed width (9999=>infinite), but .. you have to consider that its width will be 100% of the page, so, if you have the option center slider’s slides enabled (responsive settings), then
a) if the original image is wider than the window’s width the browser will resize it’s width: window’s width , customizr css sets its height: auto (aspect ratio preserved) => then the centering feature will resize the height to fit the container height (for desktop is 500px or the value you set in the sliders options), and keeping the aspect ratio will enlarge the width + center the slide horizontally => cut off right/left
b) if the original image is less wide than the window’s width the browser will resize it’s width: window’s width , customizr css sets its height: auto (aspect ratio preserved) => then the centering feature will just center it vertically => then cut off top/bottom
Disabling the centering feature you will not have cut-off, but your slider will not be centered, and you might see some blank space between the slide and the its next content.
About the text above the slider, is per slide, and you can set it while building up the slider filling the slide field Description text (below the title, 250 car. max length)
Hope this helps.
