I have not seen any settings for coasting. Where would one find that in Cura?
But, every printed object will have a seam where the layer ends meet. On the walls this is seen as a small line up and down the printed object. The slicer is showing me a skip between the ends of a wall layer. This produces a gap line up the outside wall of the sliced image. Image you took a router to your board and made a groove. Or a gap between the layer ends.
It's really hard to know what you're talking about. A screenshot, a project file, even a gcode file would be helpful. Do you have Coasting enabled? That will look like a gap in the preview because there is no extrusion during the coast portion of a move.
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