You can include them with the code :BUTTON_NAME: and |BUTTON_NAME| (With and without text)

The list is here.

That large scale bar is actually correct, it's just that it is a bit larger than you want.

That particular scale bar is 50 map units large, so at scale 1, it will fill the entire map width. But you can use that knowledge to make it the size you want it. Because if it is 50 at scale one, well, then it will be 5 at scale 0.1.

I might not have been spesific enough when I said scale bars should always be placed at scale 1. What I really should have said is "don't apply metric conversion to the scale for scale bars.". Placing it at 0.3048 will never work. But sensible scaling based on 1 as the default value does, so using 0.1 as I described above, it will be one tenth of it's "intended" size, which should work fine for your map. Or maybe you want 0.2 (which then results in a 10m long scalebar)

Looks like you have just drawn outside the map border instead of properly enlarging the map. This can cause some issues with certain tools that tries to operate within bounds.

Fortunately, this is easy to fix. If you hide all layers but MAP BORDER, you should see a set of 4 lines forming a rectangle (usually bright green). This is the actual map border. Simply move these, or erase and redraw them where you need them to be. They are just basic lines, on the MAP BORDER layer and BACKGROUND sheet.

(Feel free to unhide more sheets and layers when moving them, I just told you to hide everything to easily see them. You'll probably want to have most stuff hidden though, to make them a bit easier to manipulate without accidentally moving other stuff. Note also that the MAP BORDER layer is usually frozen, if so, it needs to be thawed before you can manipulate the entities on it)

If the lines are already correctly placed, it can also indicate that you have rogue entities on the MAP BORDER layer, ONLY the four lines forming this outline should be there, other entities will confuse the tools

Also note that for the grid in particular, you can also click on Select point in the dialog to place the grid manually to control exactly where it ends up.

You can't zoom to a specific % because that concept doesn't really exist in CC3+. CC3+ is CAD software, and the content is always rendered to whatever size you select, there isn't a "full", "print" or "actual" size.

With an image editor, zooming to 100% makes sense, because that means that each pixel in your image is being showed as the same size as a pixel on your screen, but CC3+ maps aren't expressed in pixels.

For print size, that really depends on what scale and paper size you want to print at. As with showing on screen, print isn't a fixed size, CC3+ renders the output to match your print settings.

Considering your screen is likely to be much larger than a sheet of paper (unless you are working on a laptop screen), zooming to show the same content that will be on your paper wouldn't really give a perfect view of how it looks on paper anyway, since the paper is so much smaller.

I think it is important to realize Steampunk is fantasy though. And with that I mean, they do fantastic things with the steam that isn't possible at all under real world physics. In many cases, you see them approaching semi-modern concepts (while still being in the Victorian age) but using steam instead of electricity and more practical fuels. So when drawing steampunk, it isn't "will this be possible using steam", but more "does this seem cool and somewhat plausible if we ignore actual physics?" all the way to "this doesn't seem plausible at all, but it is damn cool".

Many steampunk settings uses things like automatons, which are large steam-powered robots, both "human-like" and "this-is-a-big-machine" like. Sometimes intelligent, self-operating, in other settings controlled by an operator.

I like the city-building computer game Frostpunk for it's visuals. It' is basically Steampunk in the cold (concept art) (automatons)

Another interesting omputer game that takes the concept pretty far and some more, is Sunless Skies. Here you pilot a flying locomotive through the void between the remains of a broken world floating as islands in the void. Even the sun itself is an artificial steam-powered contraption.

For overland maps, I think the difference lies much in the symbology used. Steampunk likes to say, "Hey, here I am!". A typical steampunk map would be something in between a modern map and a fantasy map, and would use symbols and map decorations with a steampunk flair. Symbols would look more like the fantasy symbols, i.e. drawn from an isometric view, not the minimalist top-down symbols on modern maps. Instead of a caravan representing a trade route, you would see a train symbol, you may have dirigibles instead of ships, the city symbols would probably have some smoke stacks and visible pipework in the artwork, and so on.