These are the steps you can take if you need to make your truss picture bigger in Component draw.
1. Click on the truss and click on the component drawing tab.
2. When the component drawing comes up on the screen RMB click on the Truss picture.
3. Click on the button that says resize truss.
4. This will take you to a command to click and drag a window to the size needed. Once you have the window where you would like and release the mouse button. (You are limited to the size of the box on the component drawing)