Display full length caption in Lightbox

Hi, 
I am using the below code from @brandon to add captions to my gallery lightbox.
There seems to be a limit to the length of the caption using this code. 
Can the code be modified to show full captions or is there another way to show the full captions?

Thanks in advance
 

<script>
/**
 * Add descriptions/captions to galleries in Squarespace 7.1.
 * JavaScript
 * © @brandon (Squarespace Forum User)
 * This software is provided "as is", without warranty of any kind, express or implied.
 */
document.addEventListener("DOMContentLoaded", function() {
  addGalleryItemDescriptions(".gallery-lightbox");

  function addGalleryItemDescriptions(gs, gdzs) {
    var a=['querySelectorAll','section.gallery-section,\x20.gallery-lightbox','length','[class*=\x27-item\x27]:not([class*=\x27item-\x27])','getElementsByTagName','img','alt','trim','createElement','div','className','gallery-item-description','textContent','appendChild'];var b=function(c,d){c=c-0x0;var e=a[c];return e;};(function(c,d){var e,f,g,h,i,j,k;e=document[b('0x0')](c?c:b('0x1'));i=e[b('0x2')];while(i--){f=e[i][b('0x0')](d?d:b('0x3'));j=f[b('0x2')];while(j--){g=f[j][b('0x4')](b('0x5'))[0x0][b('0x6')][b('0x7')]();if(g){h=document[b('0x8')](b('0x9'));h[b('0xa')]=b('0xb');h[b('0xc')]=g;f[j][b('0xd')](h);}}}}(gs,gdzs));
  }
});
</script>

I remember Gallery Caption has a limit width. Can you share link to page where you use gallery? We can take a look