Hi Scott!
You should be able to use the scrollwheel up and down in the Flyout panel (the grey overlay where you grab new action blocks), but in the main Action Canvas area you can click and drag in the white space to pan around, sort of like the "hand" tool that you get in PDF readers or some other tools.
Here's a video showing it in action -
https://www.screencast.com/t/H0QHRRbsu- Nav