In the Favorites panel within each resource, there is an area where the on-screen text (see below) advises that you can save a favorite article, passage, person, place, thing, or document.
However, the only items that will remain in this section are favorites (bookmarks). There is no way to save a person, place, thing, or document in this area. Anything dragged and dropped here disappears when you close the resource and open it again, except for favorites (bookmarks) connected to the resource itself.
Previously, there was an issue where the "Add" button would not appear until you closed and reopened the Favorites panel. Additionally, the favorites you did save would not show unless you added one using the "Add" button. These issues seem to have been resolved in the latest Beta 39 update.
The remaining bug prevents anything else from being permanently saved in the panel. This is a consistent issue. I can save documents, notes, and favorites from other resources, which appear and remain in the main Favorites panel when I save them, even though they mysteriously disappear from the "in-resource" panel.
Logos assistance would be appreciated.