You can change the layout of a frameset whenever there is a need to do so. Simply select the frame that you want to alter and select the desired action.
By using the buttons shown in Figure 8-14, you can add, delete and alter the contents of the frame. You can then size the frame by dragging its border, or by specifying a precise size in the Properties box, as previously described.
When you are designing frames and framesets, the View menu contains the following commands:
This refreshes the content of each frame with changes you have made since opening the frameset. ...