Hey, @BrandexPublishing!
Thanks for writing in! Regarding your responsive layout, I have tried setting things in the builder and they seem to be working as expected. One thing to keep in mind is depending on your screen size, you might not be seeing the same breakpoint in the preview that you might be setting in the controls. See the following:
Notice that on this screenshot from my computer the XL breakpoint is selected in the responsive picker (which is 1200px and up), but over in the workspace it shows the currently active breakpoint (denoted by the blue icon) as LG. This is because with the workspace present, it cuts into my screen real estate a bit and LG is technically the “largest” breakpoint I can see in the builder, while on the frontend I can actually see XL. All this to say, it’s just important to ensure that you’re actually editing the proper breakpoint by selecting the appropriate breakpoint tab in the workspace when working on layouts. I’ve created the following selections as well in the builder, which all appear to be working:
I have confirmed that these are all working on the frontend as I have set them in the builder. If there is something else specifically you are referencing that I’m not touching on here, please feel free to provide some more details so I can look into this more thoroughly for you. You should absolutely be able to define the layout structure of your archives within the page itself. If you start from a completely blank page, you can use one of our Starter Templates, which feature layouts I’ve created using our native Elements in the builder that you can tweak.
As for the “Category Archive” text, where are you seeing that so I can help direct you?