How can I change the dimensions of the WPF?

Use the following two parameters to define the size of the WPF as it appears:

FRONTEND.FORM_WIDTH

FRONTEND.HEIGHT

By default the two parameters are in pixels, meaning a value of 100 results in 100px.
You can also send the sizes in % for instance by specifying % as well.

Example:

FRONTEND.FORM_WIDTH = 100%

FRONTEND.HEIGHT = 450