That isn't the template file. It's the example map for the Traveller System Bitmap style.

The template is blank and ready for you to make your own map.

If you want to get started with Cosmographer and what you want isn't in the User Manual there are a couple of recorded live mapping sessions here that might help - even though none of them cover this specific style.

I've added a Displace to the ROADS sheet. It may be a bit too much.

Take it off?

Things have moved on a bit now. I've given the colour scheme a bit more depth and earthiness and done quite a bit to the mountains.

As always - say what you think. There's still time to change things yet.

It has it's limitations since you can't cut a slot out of it, but you're welcome :)

So the islands are vanishing?

When you change the properties of the water you are also changing the properties of the magenta cut-outs. They need to remain unchanged.

Try starting from the state of your first screen shot and change the ocean again without picking the islands, or carefully deselecting them so they remain unchanged.

Or, if you have already changed everything to the other water fill, try picking the islands only and changing them back to magenta polygons using Change Properties.