Hello,
Sorry to say but unfortunately there isn’t a separate option available right now to change the Add to Cart icon on the Shop or Category pages. It appears globally for these Pages like you are seeing.
But a slightly more difficult alternative way is possible in this regard which you can try out if you want.
Here is the Video Guide to that for your reference:
https://www.veed.io/view/012c790b-a565-4752-aed3-b0ead9135411
Here is the CSS that was shown in the Video which you can modify to your choice accordingly as described in Video:
.term-accessories .wd-add-btn-replace .add-to-cart-loop:before { content: "\f120" !important; }
Location to paste Custom CSS, go to Dashboard >> Theme Settings >> Custom CSS >> Global CSS section >> paste the CSS there.
Hope this helps !
Best Regards