The Windows tab does not show Layers as an option. What am I missing?
That SketchUp doesn’t use layers. It uses Tags instead. You should see a Tags panel in the default tray.
Make sure you use them correctly. All edges and faces are created and remain untagged. Only groups and components get tags.
Thanks. Is there a version that does use layers?
No. Not anymore. The term Layers was replaced with Tags several years ago. They are used in the same way, though.
Tags are just a new dumb name for Layers designed to cause endless confusion. Functionally they are the same.