The Flip Doors All at Once tool within the Flippers group from the Project Refinement tool-set can help flip all selected doors at once as opted.
After the ribbon button is clicked, the tool asks for what factors to flip.
If the OK button is pressed, the tool will flip all of those selected doors accordingly. An information box will finally appear to show what have been done.
If all those selected doors look as the first screenshot demonstrates below, they will be flipped as second after the operation.