A350 questions

[Boroda]

https://cimg2.ibsrv.net/gimg/pprune.org-vbulletin/980x2000/screenshot_20191129_074631_adobe_acrobat_cef187b912af4ca93fc fb8304d84b7415904008e.jpg
What for this small button opposite to validation key side?

[Boroda]

I remember SFI showed that it is possible to create on ND any trajectory from aircraft symbol without stored points to avoid CB or any zones but I cannot recall how, I can do only one leg

Thanks