A JavaScript (I think) related question

I built my website www.gbhs.com.au using Blocs a few months ago. Since then, there have been a few changes made to the HTML/CSS which I am a little familiar with but there are a couple of things I would like to change, which I think are related to the javascript files:

The loading throbber (I would like to remove it)

I have changed a few things already since I prototyped so I’m not in favour of republishing my website to make these changes, especially if it is a simple remedy by editing a line or two in the javascript. I’m not familiar enough with javascript to know which file to look in and what to edit to take it out.

Could someone help?