Previous Artboard selection needs to be in destination
Selection of 'Previous Artboard' option should've been under the destination section and not in the action section of the prototype menu.
Logically Previous Artboard is a destination and not an action.
Armando Scuro commented
To be honest, the prototype menu looks ugly AF now,
1. too many dropdowns and different field sizes make it look like a bad form page
2. too hard to scan for what you are looking for with lack of icons and weird choices
3. huge margins on the side.
Hope they redesign it soon