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When finished with the layer content on a couple layers, you can merge layers, using one of the merge tools to combine them.
There are two merge tools:
- Merge with below takes the selected layer and combines it with the layer below.
- Merge all layers combines all your layers.
Merging layers in Sketchbook Pro for desktop
Use Merge with below to combine two layers into one.
Tap the upper layer's marking menu 
and choose 
to merge it with the one below
Or use the hotkey combination Cmd+E on Mac or Ctrl+E on Windows.
Use Merge all layers to flatten all layers in the project into a single layer.
Tap the upper layer's marking menu and choose 
to merge all layers. The merge action will include locked layers and hidden layers. Unhide all layers with data you want to keep before merging as hidden layers will be lost in a merge.
Merging layers in Sketchbook for mobile devices
In the Layer Editor, double-tap a layer to open the Layer Menu.
If you plan to merge only two layers, tap the upper of the two layers to open its Layer Menu. If you are merging all layers, or all visible layers, you can open the Layer Menu on any layer.
The default action is to merge two layers. Tap the icon to merge the current layer with the layer below it.
To merge all layers, or all visible layers, tap 
to access the additional options.
