I've looked in options and tried to find somewhere to set the amount of images to allow more than 100. Reading the documentation I was unable to find anything relevant to that setting. It might be there but I couldn't find it. Also, did a forum search but probably was not entering the right search terms because could not find anything relevant.
The only place in the options I found the number 100 was under Display>Category view settings where the Pagination Default Value (Category View) is 100. Is this where I would change to allow more images to be visible in the gallery thumbnail view?

Thanks in advance for any assistance with this.
