Click Edit > Surfaces > Align to see the Align Options dialog box.
When you do a planar cut, all arrows must point to the side of the surfaces to machine.
Use the Align command if you have many surfaces and the arrows are not on the correct side of the surface.
Align
Select Towards or Away From a point or a vector.
a Point / a Vector
To use a Point, you do not need to create a reference point if you have a location, like an element endpoint or a center.
To use a Vector, you must indicate two locations. If the elements are available in the drawing, you may not need to create reference geometry. Normally a line is good to use for a reference vector.
SURFCAM uses the location of the surface corner with the arrow to determine which side the arrow must point toward. You may need to do the alignment in more than one step if you have difficult geometry.