There aren't any rivers on "RIVERS Gorge" where you have the effect.

They are mostly on RIVERS.

With the really wide one being a gap between 3 polygons on the LAND sheet

If you want the rivers, or some of them, to have the effects on RIVERS Gorge you need to move those rivers to the RIVERS Gorge sheet.

This is all about sheets, not layers.

I decided that the compass was too big for the standard 100 mile scalebar (the one above really is 500 miles at default scale), so I made another 2 to go with the smaller scale bars - removing a level of detail for each one. I hope you still like them.

Here's a quick scale bar and compass.

Thank you, both :)

@Calibre I think I mentally included them as "ravines".

I think I have most things covered, though not specifically mangrove. There is a swamp fill, and a tropical forest fill, so you could make a mangrove using a patchwork of those two. However, unless your mangrove is the size of a county it won't really register as more than a dot on a world map.