On the Symbology tab:
Selected Feature - Select the color and weight (thickness) of the symbology for selected features.
Dynamics
Line - Select the color and weight (thickness) of the symbology for the rubber-banding lines when editing features.
Vertex - Select the color and size of the symbology for rubber-banding vertices when editing features.
Sketch
Line - Select the color and weight (thickness) of the symbology for the lines of sketch features.
Vertex - Select the color and size of the symbology for the vertices of sketch features.
Selected Vertex - Select the color and size of the symbology for the selected vertices of sketch features.
Profile Vertex Guidelines - Here you can turn on or off vertical and horizontal guidelines and determine their color and weight (thickness).