Was it the Glow Effect, or the Outer Glow one, you were using? Outer Glow does need more work to stop it looking like a solid mass outside the highlighted object sometimes, as there are more elements of it you can adjust. Glow usually works quite well without having to do this, particularly for circular objects (Glow doesn't work so well for the corners of angular objects however; Outer Glow is much better for those).

You might want to think of swapping the locations for the Red Sun and Georgia systems, as the red coloration isn't so easy to see against the darker sky background. The yellow for the Georgia system should still be fine against the darker area where Red Sun is currently.

Looking over the various CC3+ fills available for dungeon/battlemap use (in the Bitmaps/Tiles/Dungeon folder of CC3+), it seems although there are a number of random stonework options including in DD3 already, as well as the Bogie and Dundjinni free collections, something like the cobblestone arcs isn't. There are a few options for adding patterned stonework floor textures (there's a herringbone brickwork option in DD3, for example), and rather more for using individual patterned tiles that can be fitted together in squares separately (think medieval cathedral floors), but I suspect the arcs make creating a seamless texture that will properly tile too difficult. Or at least, nobody seems to have done it till now. I could have missed something though, so please feel free to leap in to say so!

If you're going for a more natural growth look, it may be better to use smoother lines for the tunnels and caves. The fractal edges right now is what made me assume they'd been tunneled in.

And don't forget the third dimension - no reason that couldn't be an ascending, or descending (or both in different places), spiral, rather than one on a more or less single horizontal plane.

Some of the expanses of farmland look like scaled skin - civilisation built on the back of a dragon, perhaps? 😉🐉

You could perhaps fade-out the outer edges of the whole, maybe using an overlay sheet with a large Edge Fade Inner Effect, to get away from the "edge of the world" look of too much in the map's centre compared to the periphery.

Text in banners might be too elaborate for this map; probably worth trying just text at first (you can always add banners later if that still seems needed).

When you say "edit a Scale Bar" do you mean you need to change the number at the end of the bar from what you originally set when you placed the symbol, or do you want to make changes to various elements of the Scale Bar symbol itself beyond this?

I ask, because if you need to just change the number you typed in, if it was wrong, say, I think the only way to do that is erase the original symbol and add a new one, with the correct number for the length of Bar you need typed in.

If you want to make more changes to other elements of the Scale Bar symbol, you can go to Symbols -> Symbol Manager... from the drop-down menus, select the Scale Bar symbol from the illustrated list there (assumes you have already used the Scale Bar in your CC3+ drawing, however - if not, do that first!) and then use the Edit button. This asks you to draw a new window on-screen, and when you've done that, the symbol will appear in that and you can edit any part of it, just as you would with any other drawn element in CC3+. Depending on the style, there may be limits to what you can change (you can't edit the look of a bitmap fill style used in the symbol like this, as far as I know, for instance), but it should let you make some changes at least.

When you're done, click the little "X" box in the top right of the editing window, and you'll be asked if it's OK to keep the changes you made to the symbol. It also has the slightly disturbing note "This is NOT undoable", but this will only change that specific symbol in your current drawing if you save it this way, not in the main symbols catalogue for that style.

That will change the symbol(s) used in your current drawing to whatever your edited symbol looks like, and any fresh versions of the same symbol you use in it.

Hope this helps.