Layers not on menu in SketchUp Viewer for ipad

Hi, I’m a long time amateur SketchUp user but new to the iOS Viewer, which I just recently discovered.

The User Guide for SketchUp Viewer says there should be a Layer icon and that, if it’s absent, it can be turned on from the Main Menu icon, but I don’t see either a Layer I or or a Main Menu.

Can anybody clarify?

Several years ago, in all versions of SU, the word Layers was replaced by Tags.

Thank you! IDK how I overlooked that!