Select the image layer and choose Delete > Painting > Delete Active image layer
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You can delete an image layer to permanently remove it from a canvas plane.
When you delete an image layer:
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The active image layer is deleted.
If you try to delete the last image layer on a canvas plane, a new blank image layer is created to take its place (since every canvas plane must have at least one layer). See Delete a canvas plane for how to delete the whole canvas plane.
To delete several image layers at once
icon for all the layers you want to delete.