Unable to add Navigation Layer to TileMapLayer

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1

Godot Version

4.3

Question

Sorry if this is a simple question. I am trying to add a navigation layer to my TileMapLayer. When I select “paint” → “paint properties”, I see “No navigation layers” and I cannot paint navigation tiles.
The tooltip says that I can create and customize NavigationLayers in the TileSet resource, but I am unable to see how to do that in the inspector.
In the TileMapLayer inspector, “Navigation Enabled” is checked.

Thanks for your help!