Modify Arm

Right-click component Modify            Shared Dialog Box
Modifies an arm. Learn about Arm Geometry.
 
For the option:
Do the following:
Arm
Enter the name of the arm you want to modify.

Tips on Entering Object Names in Text Boxes.
Thickness
Specify the desired thickness of the arm geometry.
Symmetric
Enabled when you modify component pairs (or brothers):
yes - Modify properties of both components in a pair.
no - Only modify properties of the selected component.
When you modify a single component, this option is disabled because a single component is by nature asymmetric.
Select to display a dialog box where you can add multi-line comments to any entity, to describe its purpose and function. Your template-based product displays different comments dialog boxes, depending on the entity type for which you want to record comments:
If recording comments for modeling entities in Standard Interface, your template-based product displays the Entity Comments dialog box.
If recording comments for any other entity type, your template-based product displays the Modify Comment dialog box.
Learn about Recording Comments.