How to stop black bar in Swipebox covering up bottom of picture?

I like the simplicity of Swipebox, but I was disappointed to see that a thick black bar containing the left/right navigation arrows covers up a chunk of each photo across the bottom.

This means that if you want to use those arrows to cycle from one photo to the next, you are always obscuring a part of each picture with a black bar. It seems like an odd design choice for a lightbox that is intended to show the pictures. Why deliberately cover part of each picture with a black bar?

Is there any way to remove that black bar and have the navigation arrows off to the side somewhere?

Thanks for any advice!

Doug

https://wordpress.org/plugins/responsive-lightbox/