Help with My Pictures folder?

I am new to Win xp and have now added a large number of folders containing pictures within the "My Pictures folder". I would like to view ALL these picture folders as thunbnails but can find no way of changing them en-mass without changing all my data folders as well - those I want to leave showing as "Details".

Is there a way of changing just the contents of "My Pictures" to the same view without having to alter each and every one of them individually please?
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