Another map for the atlas. Thanks.

Thanks for the contribution. Map now in the atlas.

This map is now in the atlas. Thanks Quenten.

The reason you can't simply change the fill is because they are symbols. Changing the properties of a symbol won't change the entities it is made up from. (May feel weird for a simple symbol like this that is just a single entity, but symbols are often made up of many different entities with different purposes, so just changing them all doesn't make sense). Symbols needs to be exploded before you can change the properties.

On my phone right now, so I don't have a detailed guide for you but the easy way to approach this is to use a symbol scaled at 1.0 as a guide when making your new symbol.

When you define a new symbol, CC3 assumes the size you make it in is the default scale.

And scaling it to 1.06 in the symbol manager won't do much, as that just enlarges it by a tiny amount. To set it right you need to scale it to something like 0.22. Remember, scale 1.0 is the size you made it at, so anything above 1 when scaling makes it larger.