Can I make a layer only show up, when the slider is in fullscreen?

If you are using the  Fullscreen control, then with a little bit of extra code you could make some of your layers only showing up, when your slider is on fullscreen. Go to your layer's settings, and add a CSS class to it, like in my example it will be "showonfull":

Turn off your layer's visibility on every device:

Then turn on your  HTML control, and write this code into it, where the "showonfull" should be replaced your CSS class name:

<style>
.n2-ss-in-fullscreen .showonfull{
display:block!important;
}
</style>

And that's it! When your slider will be in fullscreen, those layers will be visible, which are in this case having the "showonfull" CSS class on them.