Changing metadata.xml file?

I just had a course published to our LMS provider. The course window is small which unfortunately affects some of our graphics, making them unreadable. Our admin said that there was nothing in the metadata.xml file to indicate specifid window sizes and said that we would need to add that info here; right now it's going to their default window size.

What do I need to do to specifically tell the LMS (Skillsoft's Skillport) to make the course window larger? Is it a setting i need to select in the Presentation options or player template options? Do I manually add this information to the metadata file? How do I add it?

We are looking to launch by Friday, so any guidance is appreciated - thanks!