That's just the default option that comes up when you start to save, but it shouldn't be the one you ever choose to use. Just navigate away from that default to save your image files where you need them to be - I use a special set of folders in my Documents folder for ease, for example.

Glad to know you'd got the problem of saving images sorted now at least!

Yes, those dormers come in very handy for hiding unwanted chimneys; done this myself before for a tropical settlement map in the Atlas!

Often, shadowing problems like this can be improved by softening the appearance of the shadows, to make them more subtle (increased transparency, reduced size, altered colouring, adjusted blurring are all possibilities).

The bridge shadow's showing an odd gap, and its presence illustrates that a shadow effect stacked on another one starts to look odd - the bridge is further from the sea than the cliff bases, yet its shadow is more distinct, for instance.

One option to escape that double-shadowing trap might be to use the existing shadow effect lines and areas to redraw the shadow as a separate polygon, and then turn off the shadow effects entirely. Using one of the "Solid" bitmap fills might work for this, or just a normal darker grey polygon with a suitable transparency effect.

There's also the possibility of adding some extra shadow effects to the little rocks in the sea, as they currently don't have any shadows, which makes them look a little odd where they're exposed to the light. If they're all only low-lying rocks though, they'd cast negligible shadows from this viewpoint anyway, so that may be a shadow effect too far 😉.

There are some basic geometric vector shapes available in the Symbols => Maps => Other folder, as "Geometry.fsc". These have a fixed colour, however, but if you have the CA62 Geometry.fsc symbol catalogue as well (it's in the same folder), that has varicolor options for the same basic shapes. That might expand your vector symbol options sufficiently.

As for converting colour maps to black-and-white, try adding an RGB Matrix Process effect set to "Gray", and see how well that works. You may need to adjust the full-colour version of the map to keep the contrast sufficiently clear in the greyscale view, but you can turn it on and off as required for exporting images of the map.

Fractal Terrains can export as an SVG, apparently, BUT it's not available as standard, and it may not work properly. There's a trick to it, and caveats - see this Forum post by a certain J Slayton from 2022. Your safer bet though might be using an online converter from one or other of the CC3+ "Save as..." options instead, as Scott mentioned already.