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If you were working with a reference image and are finished with it, use Delete to remove the layer containing it. When you delete layers, this frees up space in the Layer Editor for new layers.
This particularly useful for anyone using a free version with more than one layer. If you run out of layers, you can delete some to make room for new ones. Merging layers is also helpful.
To delete a layer:
In the Layer Editor, tap a layer to select it.
Do either of the following:
tap-hold
and flick
.

click
and select Delete.

and OK.There are two options for deleting: