I don't own any of them, but there's probably a few "symbols" not readily available within the Schleyscapes:

But I'm guessing some of those (cue: Forlorn Cottage) would be almost a duplicate of the CC3+ offering.

Just thought I'd drop my $0.02...

I've been toying around with large exports (100,800px * 114,800px - the final PNG had a size of 12.7GB), most of the stuff I've learned, I've commented on this thread (and then this wonderful community shared their own insights)...

TL;DR:

• JPEG should handle 64k x 64k pixels and smaller without problems
• Exporting smaller images and stitching is the best way for very large maps
• There's an annual to automate export+stitching: CA129 (september 2017)

Maybe you clicked on City -> Layers -> All BLDNGs with color ?

If so, you should be able to toggle back by clicking City -> Layers -> All BLDNGs with shading

Yes, I did use it during an online game with my now-defunct VTT.

In fact, it was one of my early CC3+ maps and I used just this style. Though I only used the cave features (part of an underground traverse).

I tried using the VTT's hex grid so the players could align their tokens to one iso-"square", but in the end I also disabled snapping to the grid, so they could fine-tune the position. Another thing I did was replace the background parchment in the map with a solid deep purple in order to give that feeling that they were underground.

A quick search in Profantasy's Youtube channel returned this Livemapping session:

I seem to recall seeing another one, but perhaps the above will do?