the size of picture frames
Do you mean the The controls for the thickness of the "Photo Border"? They are accessible in the "Layout Options" pane; you show or hide it from the cogwheel below the "Pages" panel.
But if you can adjust the size of the border - or any other options - will dpend on the book theme you are using. Each theme has specific options, and many of them disable some layout changes, for example the "Formal" theme. You have the most freedom to change the layout with the "Classic" theme.