Hello Darren,

you can try enabling keyboard control in /js/scripts.js in function Portfolio(){ ... }

where the swiper options are initialised depending on the slider type:

using keyboard parameter

var swiperOptions = {

...

keyboard: 
{  
   enabled: true,  
   onlyInViewport: false
},

...

}

but you also may want to look over this issue here:

https://github.com/nolimits4web/swiper/issues/2380

Yes, that's right however make sure you are using the options corresponding to the right slider type - in the screenshot it's the split slider (so you can have full, split and centered sliders)

Also hard refresh the page ( Ctrl+F5 )