Android Tutorial Altering existing design.

How do you make changes to the basic layout (design) of a program? I opened the following sample file: DataBaseProgSample1.5.b4a I wanted to change the sizes of the edit fields, but when I brought up the "Designer" and made a connection to the emulator, the window was blank. Do you have to start fresh, create your own layout and then add the code? I was hoping to see if I could make some adjustments to the existing one as a learning experience.
 
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