Frames
A frame is a box which surrounds the total area of an element, band or entire report. The area of an element can be larger than the text it contains. Also, remember that the text of a data field or report information field varies in the final report according to the client's data, but the size of the element, indicated by it's frame, remains the same unless you have selected Autosize width in the element's Properties window. This will cause the width of the frame to change according to the length of the data. When you resize an element in the Report Designer window, it is the size of the frame that will change, not the size of the text.
If you wish you can make the frame visible in the final report. You can also change the lines' colour and width.