CC3+ always does a split install. The actual program itself is always installed to the C-drive, but it is extremely tiny (less than 100MB with absolutely everything installed), the rest goes to the location you chose for your data directory in the CC3+ installer (Which I presume is e:\ something in your case), which is the bulk of the install (art, configuration, templates, maps, drawing tools, symbol catalogs, and all the rest)

Any add-ons installed after that will never ask for location, but just go to the appropriate directory of the two. Components needed by the program itself (mostly things like .dll files) will be added to the folder on C, but any content will be added to the data directory in your chosen location.

I don't remember the screens in the installer for the Annual 2023 off the top of my head, but at least some of our products have a screen with a checkbox that enable you to do an "artwork only" install (for use without CC3+). I don't remember if the 2023 annual had this, but if it does, make sure to NOT enable that option during install, or it will only install the artwork for use with other software, and not the CC3+ components. Try rerunning the installer and see if this is the case.

If links are obvious (like a city map linking to the labeled city marker on an overland map), you don't really need to do anything. If it is harder to understand without a explanation, either just explain it to me in writing, or put a rectangle or something (with optional text) on a dedicated layer which I can just hide or delete when I am done with it. Just name the layer something that make it obvious that it is a temporary layer and don't conflict with the MAP LINKS layer I use.

It's not that I don't like buttons, it is just that setting up toggle switches is simply more work than just handle a straight-forward map. But generally, a map with toggles are preferable to having multiple maps of the same location. The linking system in the atlas is primarily designed to link different locations together, and doesn't work as well when linking two different versions of the same map together, primarily because there is no sensible way to indicate a linking spot on the map itself for that purpose, so it will only be in the sidebar (or below the map in the web version viewer)

Thanks @Royal Scribe , it is in the atlas now.

No, please don't. Descriptions are intended as an optional extra for those that have additional information they wish to provide about the map, not a requirement.

Initially, descriptions was meant as a way for mappers to talk about technical details about their map (how they made it, and so on) to help people learn from the maps in the atlas. But people have twisted it over to be used for world lore instead. Which is fine, I guess.