Overwite Prompt - Folder Expannsion Missing

[Marcoi]

I transfer a folder to Google Drive that periodically contains changed files. When I select Overwite from the dropdown (or any other choice), I do not see the "twistie" that allows me to see the existing folder choices. For example:

All I see is:

Have I overlooked a stetting? Or is this a bug, as I recall some time ago I could expand the folder.