You should set Capture Input Options before recording. These options allow you to define the area and type of video capture.
1 First, click Capture > Input.
2 From the submenu, select your video capture input type (explained below).
The entire computer screen is captured. You will not be able to select an area or region and the file size will be maximum.
Before recording, you can select a window (or any portion of a window) to be captured. Camtasia allows you to indicate which one. The cursor changes to a finger-pointer and when you pass it over areas that can be selected and captured, they are highlighted.
Before recording, you can define an arbitraryrectangular region with the mouse. The cursor turns to cross-hairs, which you use to draw a rectangular region on your screen. This will be the area captured.
You can capture a fixed-size rectangular region. Before recording, a dialog allows you to define the size of the region in pixels. You can add a fixed starting point as well. Define a Fixed Region.