Don't bother with it. If you start to work it will disappear immediately. No loss of time.
Thank you, Will, for a quick response.
I'm still concerned though, and not just because I'm a fussy geek-nerd.
The fact that I have a version of the Welcome Screen that's missing a component makes me wonder if there might be other things going wrong under the hood.
Perhaps not, even likely not, but I make it my practice to find out one way or the other.
You're certainly correct that ignoring it obviates any loss of time.
You might make a feature request as this welcome screen is a feature in test at the moment. Not every InDesign user will see it, only those with an English version. All other UI languages have still the old welcome screen.