@victoria A few thoughts using Nightly, re: tweaks and a bit of confusion. (Not sure if comments should go elsewhere (new thread, etc.), let me know and I’ll move this.)
Screenshot with annotations attached.
1/
In the “Flex Item” info, the selector drop-down is unnecessarily truncated (horizontal w ellipsis), plenty of horizontal whitespace, so it could print the entire selector.
2/
Insufficient vertical spacing makes text unreadable, I’m not sure what is trying to be indicated.
3/
Contradictory wording describing the flexibility is confusing. The attempt at explanations is wonderful though. 
Nightly 65.0a1 (2018-10-27) (64-bit)
OSX 10.12.6
Generally the new layout tools are a great help, thank you to everyone involved!
