How do I change the transition duration of a fade animation on a gallery slide?

Unfortunately, all the elements have 0% in the background.

from my research this is what I got:

You should be able to use onChange to do whatever animation you want. onChange - Velo API Reference - Wix.com Then you can do a quick hide and show of the multistatebox. https://www.wix.com/velo/reference/$w/multistatebox/hide show - Velo API Reference - Wix.com

but then I don’t know how to edit the code properly.

Plus. the client asked me arrow navigation that should be something like:

''code
rightSliderBtn.onClick(()=>{slideRight();})
leftSliderBtn.onClick(()=>{slideLeft();})
''code