You can use the Trim Image function to remove parts of the source file that should not be retained in the figure, such as a caption, or excessive white space.
Note: Trim Image is only available for Other Figures.
To trim a figure
Outline the section to keep by drawing a rectangle on the figure.
Click and drag from the top left corner of the intended rectangle to begin drawing. Release the mouse button at the intended lower right corner.
Tip: You can move and resize the rectangle afterwards. The cursor will show which function clicking and dragging will have.
Click Trim Image.
See also Adding a figure from a file.