I attached a small string quartet file to reproduce this unintuitive behavior / bug in Dorico 22.214.171.1241 (May 24 2018), macOS High Sierra 10.13.5
In Write mode, Page View, I select the last violoncello note of the first line, i.e., the last note of bar 4. I press the right arrow key. I expect this to move the selection to the first violoncello note in bar 5. What is selected instead is the first violin 1 note of bar 5.
In Galley View, I again select the last violoncello note of bar 4 and press the right arrow key. Again, it selects the first violin 1 note in bar 5, not first violoncello note. In Galley View I definitely wouldn’t have expected this.
Incidentally, if I select the same note in Engrave mode and press the right arrow key, selection moves as I expect it to.
In any case, thanks for your work on Dorico! In general I’ve been very happy with it.
String quartet test.dorico.zip (1.97 MB)