Dorico 4.3 need help with midi pitch bends

As can be seen in the attached pic, have midi pitch bend select for the note I want to bend. I use the pointer and it draws a box where I want the pitch bend but as soon as I move the mouse the box disappears and nothing else happens so I must be missing something. Did not see this in the new key editor tutorial.

Activate the pencil tool in order to draw data into any of the editors.