Shopify theme help - change default icon/image size

Need someone to change the default icon / image size attributed to my theme template. In particular, on my "Framing Options" Page. See screenshot 1 attached.

I've traced it back to the code "store-features.liquid" and found the schema section.

Currently it shows:

"type": "range",
"id": "isz",
"label": "Icon Size",
"default":30,
"min": 30,
"max": 120,
"step": 1,
"unit": "px"

When I change it to:

"type": "range",
"id": "isz",
"label": "Icon Size",
"default":100,
"min": 100,
"max": 200,
"step": 1,
"unit": "px"

and then go back into the theme customisation portal -> "Framing options" page and then try change the icon size slider to 200px, I then get an error "Setting 'isz' can't be less than 100". See screenshot 2

What I require:
- Freelancer to log on via collaborator access
- theme codes to be amended correctly such that I can easily change the icon size to 200px and it is in full working condition on desktop and mobile.
- let me know (if any) what other codes were needing to be amended

web page address: https://ryanepstein.com/pages/framing-options