To change a line color, you have two optional ways:
Use the Comment Format menu bar.
1. Select Hand tool, click on a target line on the page.
2. Select Comment Format menu bar
3. Click on the exiting color palette or the Line Color to select a color.
Use Line Properties tab.
1. Select Hand tool, right click on a target line on the page.
2. Select Properties to open the Line Properties.
3. Click on the color icon to pick up a color you want.
To apply the current color to all lines drawn afterwards, right click on the line, choose Set Current Properties as Default.