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The emulated screen is too big for my screen and there doesn't seem to be a way of making it smaller (zoom doesn't work either).

The screen is html. Find the div with id ibm5150.videoMDA in chrome/firefox devtools and edit the width. Aspect ratio is kept.

Or simply resize the width of the browser window until you can see everything. Half of the screen seems to be fine.

Since the problem is the aspect ratio, I just turned on the dev tools sidebar, so the content area is now taller than it is wide, that worked.