Move end of chords and beginning of 2nd chord at the same time

hi guys i dont know if this is possible, i cant find it:

in KEY EDITOR:

how do i move the end of a chord and beginning of 2nd following chord at the same time?

like drag the point between two chords left and right

see attached

with Selection Tool selected, ALT + SHIFT doesnt do anything in my version of 15 Pro

maybe its free for this? can we bind this function to this?