Modifying Drawing Object Borders
To modify Weight, Color and Style of borders of drawing objects:

In the
Border frame of the
Colors and Borders tab, select the desired values in the drop-down boxes.
Color
To hide your lines and borders:

In the
Color drop-down list, select value "No border".
Style
To modify style of elements:

Click the desired border style.
To obtain a thicker or thinner line:

Select a border style and modify the
Weight parameter.
Weight
To modify weight of elements:

Select the desired border weight.
To obtain a thicker or thinner line:

Enter a new value in the
Weight drop-down list.