hi @Martyn and thank you for using Lumi.
Lumi was created with the standard elements available in Elements. If you understand how the standard Elements work, you’ll have no problem editing the project.
1: Standard menu with desktop and mobile versions (which you see by activating the preview)
2: Standard modal window (guide) with trigger and content (which you see by activating the preview)
trigger
modal content
If you need further help, let me know.