Can't find my colour swatches, set to uploaded

Hey all, I am trying to change my colour swatches. They are currently set to uploaded, and are two toned. I would like to change them to single tone, I understand I have to upload them and follow the same naming to ensure they appear appropriately.
I however cannot find the existing swatches anywhere in the website files, and when I try to change from circle to natural to square, I don’t see any updates occuring on the site. Furthermore, the user guide shows that I should be able to adjust some setting in my Showcase theme that doesnt appear:

From the sidebar

In my products area

From the userguide:

My client had only one collection and they are now exapnding, I assume the last designer did not account for multiple collections in future so I will have to do a lot of colour renaming to match the files, but ideally I would like to find them first and follow the proper steps from the get go..

My main goal is to be able to view, update and modify the uploaded images and related swatches for the products.

My theme is Showcase, so I wouldnt imagine there to be a theme conflict issue. Any input would be great help! Thank you in advance.