I'm not sure how this is called correctly but the shortcuts you get for each letter as you can see in this image for example (https://tooagile-wpengine.netdna-ssl.com/wp-content/uploads/2015/09/1Password-6-Hero1.png) seems not to work in my iPad with iOS 10.3.x.
When I click on "M", the app doesn't scroll down to my logins beginns with "M".
1Password Version: 6.5.2
Extension Version: Not Provided
OS Version: iOS 10.3.x beta
Sync Type: iCloud