Carbide Create Design Question

If I want to mill a quarter inch slot with a .25 end mill. Why does the tool path not come into existence until I make the slot width .251?

Am I not understanding something?

Currently the tool has to fit into the shape.
Selecting “on the line” would be a way to get a single groove the width of the tool.

You’re saying, don’t draw a box, just draw a line, correct?

Unfortunately, you can’t dr open-ended paths in CC — draw a closed path which borders where you want the line cut and use the follow path CAM option.