It seems to have disappeared, perhaps 10 minutes ago. If it appears again, I'll let you know. It was always a different ad, and it appeared in two places: at the bottom right of the window in question, and at the top of the column at the right on the Favorites page.
The first letter in the left column of Favorites page is cut in half, why? And I am not using the app, I’m still using the website access on an iPad using Safari…