Carbide Create can’t directly do dovetails with a preview — they require undercuts which it can’t model.
If you used a dovetail router bit and a jig which held two boards at right angles at the front of the machine you could do this — but you wouldn’t be able to get a preview in Carbide Create and you’d have to work up suitable feeds and speeds (you’d probably want to use a square endmill to clear the bulk of the area first).
There are a number of alternative options — fingerjoint boxes are pretty straightforward and I worked up instructions here: CNC Box (Finger) Joint Box
The community has some notes on joinery at: https://www.shapeoko.com/wiki/index.php/Fabrication_Techniques_%26_Hardware#Joinery