How to blur a Tilemap

Godot Version

4.1

Question

I made the background for my game using Tilemap and want to add a blur affect to make it look like it’s far. I tried the WorldEnvironment node but it didn’t help (or I don’t know how to use it right) .
screenshot link

When I moved the node to be a sibling to the Tilemap, a warning that I don’t understand appreard.
screenshot link

Did you read Environment and post-processing — Godot Engine (stable) documentation in English ?
You should set the mode of the WorldEnvironment to “Canvas” because you are using a 2D node. DOF Blur is for 3D nodes.

The warning says that you have two environments, so you need to remove one of them.

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