Set height of a scrolled-canvas

[Luis López]

Hi!

I'm trying to simulate a diffraction grating for my pupils. I have two
scrolled-canvas: one for displaying the spectrum as colors, and one for
showing its intensity profile.

The problem is that I want to make the first one to have a specific height
(no matter if the window gets maximized), and the other to get expanded,
but all I can get is the two having always the same height. What am I doing
wrong?

Thank you very much,

Luis
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