Built-in overlays are overlays that are attached to a specific background. If a background has OL in the name, this means there's a built-in overlay, although some backgrounds with built-in overlays don't have the OL.
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Built-in overlays are automatically placed at the highest layer, meaning your characters will automatically be behind the built-in overlay.
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You can use the background's name as the built-in overlay's name to layer or move the built-in overlay. You have to add it with the background's name to layer, scale, or shift it. Check out my Overlay Guide to read up on placing overlays with the background name.
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Example:
You must add the overlay with the background name. This will not work if you use the create command. Using the create command will only add a duplicate overlay to your scene.
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If you want to completely remove the built-in overlay from the background, you will need to add the overlay to the background like above and use the overlay clear command.
Notes:
You can use any built-in overlay with any background. Built-in overlays are exactly like regular overlays; the only difference is just using the background name as the overlay name.​
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If you want to use the desk overlay from INT. INTERN OFFICE OL - DAY and add it to your own background, you can!
