Background Market » Changing background colour and texture problems

Hello,

In my current map project, I have a textured background (parchment) as the lowest layer with several objects placed on top. (I am using Designer).

What I want is basically to be able to colour the background which will be the ocean and still allow the texture to come through in the ocean and continents.

So, I draw a rectangle and choose a colour and low opacity over the texture (i.e. across the whole document). However, the other objects (the continents) on top, are also affected by this ocean-colour. I want them to keep the parchment texture, but for the ocean colour to not affect them. I can't have them on 100% opacity because they are duplicated with overlay at a low opacity to allow the coastline to look more hand-drawn on parchment. Is there any way to seep the continents from being affected by the ocean colouring below?

Thank You!!!

I didn't find the right solution from the Internet.

References
https://forum.affinity.serif.com/index.p...xture-problems/

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