The options for what to see when opening the HTML Editor are to open a new document, open the last document you were working on, or open no document. If you choose the last option, you will see a list with the last files you had open. As far as I can tell, that advert you mention hasn't been seen for the last couple of versions. Maybe you need to get a newer version.
Ha en riktig god dag!
This site was made before we were able to create components through the app:
Component sharing for RFF, RBB, RSD and SD: https://eikweb.com/sharing/
My work in progress right now:
Components for the same as above + HTML Editor: https://mock-up.coffeecup.com