The version 2.3.0 RC10/1760/2bfc593d release notes advertises the following enhancements:

Enhanced the note marker selection menu options to work not only for single fretboards but across multiple selected fretboards. You can now..
  • select the same note on different fretboards
  • select the same interval on different fretboards, even if different underlying notes
  • select notes on matching strings across different fretboards

I can't seem to find any way to select a specific interval across different fretboards. The menu options are as follows: Menu.png

Can someone please clarify?