Change the Vector Size
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From the Plot tools, click the Vector tool.
Figure 1. 
- From the Vector panel, click the Display tab (located in the middle of the panel).
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Select an option from the Size scaling drop-down menu.
Option Description Auto Automatically scales the vector length (the average vector length will be approximately 2% of the model size). Note: This is set as the default scale mode.By Magnitude The vector size is displayed relative to the value of the vectors. The Scale value text box allows you to increase or decrease the size according to a scaling value.
Uniform All vectors are displayed in a uniform size. You can increase or decrease the size using the Scale value text box.
By Setting this allows you to increase or decrease the scale factor, which in turn affects the length of the arrows. Restriction: This option is only active when By magnitude is chosen.The options are automatically applied to the model as you enter information.