Just installed this. Like it so far, but there's a UI bug on the accounts screen. I have my phone (Asus Zenfone 2 running LineageOS 14.1) display mode set to "smaller", and thought that it may be causing the issue, so I reset it back to normal, but the issue still occurs. In portait mode, only the search and refresh icons appear. In lanscape mode, only refresh, search and the settings gear icon appear in the top right menu bar. I never see an overflow affordance menu to be able to select add another account. To get around the issue, I had to set one of my hardware buttons to open up the menu list, so that I could add all of my accounts.
Obviously since I found a workaround, this isn't a severe issue, but others may be experiencing it as well.