Lightbox settings/options

I’m using the Lite version, but am still a little surprised at how few options come with it. Here’s what I would like to know…

1. How can decrease the amount of dead space around a picture when it’s being viewed in lightbox? The gutter is HUGE and looks absolutely terrible on mobile views – the “enlarged” picture is brutally small because of the giant white border and gutter overlay.

2. If editing any of that ^ is not possible with the Lite version, will other lightbox plugins work with the Envira gallery so that things can actually display correctly?

Thanks for any help or info you can provide.