Ok. Thanks for the update. This will be a great help for modifying graphical components of layouts imported from ArcMap.
On a separate note. I had a very large and graphic intensive layout within an MXD file in ArcMap 10.5.1 that went corrupt. I'm assuming that the network went wonky during a save. Anyway, I imported the broken MXD into Pro and it opened! It was a nice save until I realized I could not get access to the vertices of all the graphic lines and polys. Pro doesn't allow a reverse save to MXD (obviously), but if you have to open an old MXD and it's broken, Pro may still be able to read it.
Thanks again,
-Larry